diff --git a/cmd/protoc-gen-go/internal_gengo/main.go b/cmd/protoc-gen-go/internal_gengo/main.go
index b582cbe..bd73826 100644
--- a/cmd/protoc-gen-go/internal_gengo/main.go
+++ b/cmd/protoc-gen-go/internal_gengo/main.go
@@ -26,8 +26,12 @@
 	"google.golang.org/protobuf/runtime/protoimpl"
 
 	"google.golang.org/protobuf/types/descriptorpb"
+	"google.golang.org/protobuf/types/pluginpb"
 )
 
+// SupportedFeatures reports the set of supported protobuf language features.
+var SupportedFeatures = uint64(pluginpb.CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL)
+
 // GenerateVersionMarkers specifies whether to generate version markers.
 var GenerateVersionMarkers = true
 
@@ -358,7 +362,7 @@
 }
 
 func genMessageField(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, field *protogen.Field, sf *structFields) {
-	if oneof := field.Oneof; oneof != nil {
+	if oneof := field.Oneof; oneof != nil && !oneof.Desc.IsSynthetic() {
 		// It would be a bit simpler to iterate over the oneofs below,
 		// but generating the field here keeps the contents of the Go
 		// struct in the same order as the contents of the source
@@ -550,7 +554,7 @@
 		genNoInterfacePragma(g, m.isTracked)
 
 		// Getter for parent oneof.
-		if oneof := field.Oneof; oneof != nil && oneof.Fields[0] == field {
+		if oneof := field.Oneof; oneof != nil && oneof.Fields[0] == field && !oneof.Desc.IsSynthetic() {
 			g.Annotate(m.GoIdent.GoName+".Get"+oneof.GoName, oneof.Location)
 			g.P("func (m *", m.GoIdent.GoName, ") Get", oneof.GoName, "() ", oneofInterfaceName(oneof), " {")
 			g.P("if m != nil {")
@@ -579,7 +583,7 @@
 			g.P("}")
 			g.P("return ", protoimplPackage.Ident("X"), ".WeakNil(", strconv.Quote(string(field.Message.Desc.FullName())), ")")
 			g.P("}")
-		case field.Oneof != nil:
+		case field.Oneof != nil && !field.Oneof.Desc.IsSynthetic():
 			g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", goType, " {")
 			g.P("if x, ok := x.Get", field.Oneof.GoName, "().(*", field.GoIdent, "); ok {")
 			g.P("return x.", field.GoName)
@@ -588,7 +592,7 @@
 			g.P("}")
 		default:
 			g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", goType, " {")
-			if field.Desc.Syntax() == protoreflect.Proto3 || defaultValue == "nil" {
+			if !field.Desc.HasPresence() || defaultValue == "nil" {
 				g.P("if x != nil {")
 			} else {
 				g.P("if x != nil && x.", field.GoName, " != nil {")
@@ -640,7 +644,7 @@
 		return "struct{}", false
 	}
 
-	pointer = true
+	pointer = field.Desc.HasPresence()
 	switch field.Desc.Kind() {
 	case protoreflect.BoolKind:
 		goType = "bool"
@@ -662,25 +666,19 @@
 		goType = "string"
 	case protoreflect.BytesKind:
 		goType = "[]byte"
-		pointer = false
+		pointer = false // rely on nullability of slices for presence
 	case protoreflect.MessageKind, protoreflect.GroupKind:
 		goType = "*" + g.QualifiedGoIdent(field.Message.GoIdent)
-		pointer = false
+		pointer = false // pointer captured as part of the type
 	}
 	switch {
 	case field.Desc.IsList():
-		goType = "[]" + goType
-		pointer = false
+		return "[]" + goType, false
 	case field.Desc.IsMap():
 		keyType, _ := fieldGoType(g, f, field.Message.Fields[0])
 		valType, _ := fieldGoType(g, f, field.Message.Fields[1])
 		return fmt.Sprintf("map[%v]%v", keyType, valType), false
 	}
-
-	// Extension fields always have pointer type, even when defined in a proto3 file.
-	if field.Desc.Syntax() == protoreflect.Proto3 && !field.Desc.IsExtension() {
-		pointer = false
-	}
 	return goType, pointer
 }
 
@@ -797,6 +795,9 @@
 // associates the types with the parent message type.
 func genMessageOneofWrapperTypes(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
 	for _, oneof := range m.Oneofs {
+		if oneof.Desc.IsSynthetic() {
+			continue
+		}
 		ifName := oneofInterfaceName(oneof)
 		g.P("type ", ifName, " interface {")
 		g.P(ifName, "()")
diff --git a/cmd/protoc-gen-go/internal_gengo/reflect.go b/cmd/protoc-gen-go/internal_gengo/reflect.go
index b60f4ce..1319a12 100644
--- a/cmd/protoc-gen-go/internal_gengo/reflect.go
+++ b/cmd/protoc-gen-go/internal_gengo/reflect.go
@@ -191,8 +191,10 @@
 				// Associate the wrapper types by directly passing them to the MessageInfo.
 				g.P(typesVar, "[", idx, "].OneofWrappers = []interface{} {")
 				for _, oneof := range message.Oneofs {
-					for _, field := range oneof.Fields {
-						g.P("(*", field.GoIdent, ")(nil),")
+					if !oneof.Desc.IsSynthetic() {
+						for _, field := range oneof.Fields {
+							g.P("(*", field.GoIdent, ")(nil),")
+						}
 					}
 				}
 				g.P("}")
diff --git a/cmd/protoc-gen-go/main.go b/cmd/protoc-gen-go/main.go
index 5f249be..55a58df 100644
--- a/cmd/protoc-gen-go/main.go
+++ b/cmd/protoc-gen-go/main.go
@@ -46,6 +46,7 @@
 				gengo.GenerateFile(gen, f)
 			}
 		}
+		gen.SupportedFeatures = gengo.SupportedFeatures
 		return nil
 	})
 }
diff --git a/compiler/protogen/protogen.go b/compiler/protogen/protogen.go
index 118be73..e3b9e7f 100644
--- a/compiler/protogen/protogen.go
+++ b/compiler/protogen/protogen.go
@@ -104,6 +104,11 @@
 	Files       []*File
 	FilesByPath map[string]*File
 
+	// SupportedFeatures is the set of protobuf language features supported by
+	// this generator plugin. See the documentation for
+	// google.protobuf.CodeGeneratorResponse.supported_features for details.
+	SupportedFeatures uint64
+
 	fileReg        *protoregistry.Files
 	enumsByName    map[protoreflect.FullName]*Enum
 	messagesByName map[protoreflect.FullName]*Message
@@ -438,6 +443,9 @@
 			})
 		}
 	}
+	if gen.SupportedFeatures > 0 {
+		resp.SupportedFeatures = proto.Uint64(gen.SupportedFeatures)
+	}
 	return resp
 }
 
diff --git a/encoding/protojson/decode_test.go b/encoding/protojson/decode_test.go
index c675a77..396bbe0 100644
--- a/encoding/protojson/decode_test.go
+++ b/encoding/protojson/decode_test.go
@@ -106,6 +106,35 @@
 }`,
 		wantMessage: &pb3.Scalars{},
 	}, {
+		desc:         "proto3 optional set to zero values",
+		inputMessage: &pb3.Proto3Optional{},
+		inputText: `{
+  "optBool": false,
+  "optInt32": 0,
+  "optInt64": 0,
+  "optUint32": 0,
+  "optUint64": 0,
+  "optFloat": 0,
+  "optDouble": 0,
+  "optString": "",
+  "optBytes": "",
+  "optEnum": "ZERO",
+  "optMessage": {}
+}`,
+		wantMessage: &pb3.Proto3Optional{
+			OptBool:    proto.Bool(false),
+			OptInt32:   proto.Int32(0),
+			OptInt64:   proto.Int64(0),
+			OptUint32:  proto.Uint32(0),
+			OptUint64:  proto.Uint64(0),
+			OptFloat:   proto.Float32(0),
+			OptDouble:  proto.Float64(0),
+			OptString:  proto.String(""),
+			OptBytes:   []byte{},
+			OptEnum:    pb3.Enum_ZERO.Enum(),
+			OptMessage: &pb3.Nested{},
+		},
+	}, {
 		desc:         "proto2 optional scalars set to null",
 		inputMessage: &pb2.Scalars{},
 		inputText: `{
diff --git a/encoding/protojson/encode_test.go b/encoding/protojson/encode_test.go
index 1e2ceb0..4200705 100644
--- a/encoding/protojson/encode_test.go
+++ b/encoding/protojson/encode_test.go
@@ -49,6 +49,10 @@
 		input: &pb3.Scalars{},
 		want:  "{}",
 	}, {
+		desc:  "proto3 optional not set",
+		input: &pb3.Proto3Optional{},
+		want:  "{}",
+	}, {
 		desc: "proto2 optional scalars set to zero values",
 		input: &pb2.Scalars{
 			OptBool:     proto.Bool(false),
@@ -85,6 +89,34 @@
   "optString": ""
 }`,
 	}, {
+		desc: "proto3 optional set to zero values",
+		input: &pb3.Proto3Optional{
+			OptBool:    proto.Bool(false),
+			OptInt32:   proto.Int32(0),
+			OptInt64:   proto.Int64(0),
+			OptUint32:  proto.Uint32(0),
+			OptUint64:  proto.Uint64(0),
+			OptFloat:   proto.Float32(0),
+			OptDouble:  proto.Float64(0),
+			OptString:  proto.String(""),
+			OptBytes:   []byte{},
+			OptEnum:    pb3.Enum_ZERO.Enum(),
+			OptMessage: &pb3.Nested{},
+		},
+		want: `{
+  "optBool": false,
+  "optInt32": 0,
+  "optInt64": "0",
+  "optUint32": 0,
+  "optUint64": "0",
+  "optFloat": 0,
+  "optDouble": 0,
+  "optString": "",
+  "optBytes": "",
+  "optEnum": "ZERO",
+  "optMessage": {}
+}`,
+	}, {
 		desc: "proto2 optional scalars set to some values",
 		input: &pb2.Scalars{
 			OptBool:     proto.Bool(true),
diff --git a/encoding/prototext/decode_test.go b/encoding/prototext/decode_test.go
index 9150740..50c8b5d 100644
--- a/encoding/prototext/decode_test.go
+++ b/encoding/prototext/decode_test.go
@@ -91,6 +91,34 @@
 `,
 		wantMessage: &pb3.Scalars{},
 	}, {
+		desc:         "proto3 optional set to zero values",
+		inputMessage: &pb3.Proto3Optional{},
+		inputText: `opt_bool: false
+opt_int32: 0
+opt_int64: 0
+opt_uint32: 0
+opt_uint64: 0
+opt_float: 0
+opt_double: 0
+opt_string: ""
+opt_bytes: ""
+opt_enum: ZERO
+opt_message: {}
+`,
+		wantMessage: &pb3.Proto3Optional{
+			OptBool:    proto.Bool(false),
+			OptInt32:   proto.Int32(0),
+			OptInt64:   proto.Int64(0),
+			OptUint32:  proto.Uint32(0),
+			OptUint64:  proto.Uint64(0),
+			OptFloat:   proto.Float32(0),
+			OptDouble:  proto.Float64(0),
+			OptString:  proto.String(""),
+			OptBytes:   []byte{},
+			OptEnum:    pb3.Enum_ZERO.Enum(),
+			OptMessage: &pb3.Nested{},
+		},
+	}, {
 		desc:         "proto2 optional scalars",
 		inputMessage: &pb2.Scalars{},
 		inputText: `opt_bool: true
diff --git a/encoding/prototext/encode_test.go b/encoding/prototext/encode_test.go
index b910727..076d28b 100644
--- a/encoding/prototext/encode_test.go
+++ b/encoding/prototext/encode_test.go
@@ -44,6 +44,10 @@
 		input: &pb3.Scalars{},
 		want:  "",
 	}, {
+		desc:  "proto3 optional not set",
+		input: &pb3.Proto3Optional{},
+		want:  "",
+	}, {
 		desc: "proto2 optional scalars set to zero values",
 		input: &pb2.Scalars{
 			OptBool:     proto.Bool(false),
@@ -79,6 +83,33 @@
 opt_string: ""
 `,
 	}, {
+		desc: "proto3 optional set to zero values",
+		input: &pb3.Proto3Optional{
+			OptBool:    proto.Bool(false),
+			OptInt32:   proto.Int32(0),
+			OptInt64:   proto.Int64(0),
+			OptUint32:  proto.Uint32(0),
+			OptUint64:  proto.Uint64(0),
+			OptFloat:   proto.Float32(0),
+			OptDouble:  proto.Float64(0),
+			OptString:  proto.String(""),
+			OptBytes:   []byte{},
+			OptEnum:    pb3.Enum_ZERO.Enum(),
+			OptMessage: &pb3.Nested{},
+		},
+		want: `opt_bool: false
+opt_int32: 0
+opt_int64: 0
+opt_uint32: 0
+opt_uint64: 0
+opt_float: 0
+opt_double: 0
+opt_string: ""
+opt_bytes: ""
+opt_enum: ZERO
+opt_message: {}
+`,
+	}, {
 		desc: "proto3 scalars set to zero values",
 		input: &pb3.Scalars{
 			SBool:     false,
diff --git a/integration_test.go b/integration_test.go
index 2a9a470..a6fe2b6 100644
--- a/integration_test.go
+++ b/integration_test.go
@@ -32,7 +32,7 @@
 	regenerate   = flag.Bool("regenerate", false, "regenerate files")
 	buildRelease = flag.Bool("buildRelease", false, "build release binaries")
 
-	protobufVersion = "3.11.4"
+	protobufVersion = "4b4e6674" // pre-release of 3.12.x
 	golangVersions  = []string{"1.9.7", "1.10.8", "1.11.13", "1.12.17", "1.13.8", "1.14"}
 	golangLatest    = golangVersions[len(golangVersions)-1]
 
@@ -209,8 +209,13 @@
 	protobufPath = workingDir
 	if _, err := os.Stat(protobufPath); err != nil {
 		fmt.Printf("download %v\n", filepath.Base(protobufPath))
-		url := fmt.Sprintf("https://github.com/google/protobuf/releases/download/v%v/protobuf-all-%v.tar.gz", protobufVersion, protobufVersion)
-		downloadArchive(check, protobufPath, url, "protobuf-"+protobufVersion)
+		if isCommit := strings.Trim(protobufVersion, "0123456789abcdef") == ""; isCommit {
+			command{Dir: testDir}.mustRun(t, "git", "clone", "https://github.com/protocolbuffers/protobuf", "protobuf-"+protobufVersion)
+			command{Dir: protobufPath}.mustRun(t, "git", "checkout", protobufVersion)
+		} else {
+			url := fmt.Sprintf("https://github.com/google/protobuf/releases/download/v%v/protobuf-all-%v.tar.gz", protobufVersion, protobufVersion)
+			downloadArchive(check, protobufPath, url, "protobuf-"+protobufVersion)
+		}
 
 		fmt.Printf("build %v\n", filepath.Base(protobufPath))
 		command{Dir: protobufPath}.mustRun(t, "./autogen.sh")
@@ -370,20 +375,10 @@
 `),
 }
 
-var noCopyrightHeader = []string{
-	// Missing copyright header upstream.
-	"internal/testprotos/benchmarks/datasets/",
-}
-
 func mustHaveCopyrightHeader(t *testing.T, files []string) {
 	var bad []string
 File:
 	for _, file := range files {
-		for _, prefix := range noCopyrightHeader {
-			if strings.HasPrefix(file, prefix) {
-				continue File
-			}
-		}
 		b, err := ioutil.ReadFile(file)
 		if err != nil {
 			t.Fatal(err)
diff --git a/internal/cmd/generate-protos/main.go b/internal/cmd/generate-protos/main.go
index 84b8bfe..8544cad 100644
--- a/internal/cmd/generate-protos/main.go
+++ b/internal/cmd/generate-protos/main.go
@@ -99,6 +99,7 @@
 					generateFieldNumbers(gen, file)
 				}
 			}
+			gen.SupportedFeatures = gengo.SupportedFeatures
 			return nil
 		})
 		os.Exit(0)
@@ -270,7 +271,8 @@
 }
 
 func protoc(args ...string) {
-	cmd := exec.Command("protoc", "--plugin=protoc-gen-go="+os.Args[0])
+	// TODO: Remove --experimental_allow_proto3_optional flag.
+	cmd := exec.Command("protoc", "--plugin=protoc-gen-go="+os.Args[0], "--experimental_allow_proto3_optional")
 	cmd.Args = append(cmd.Args, args...)
 	cmd.Env = append(os.Environ(), "RUN_AS_PROTOC_PLUGIN=1")
 	out, err := cmd.CombinedOutput()
diff --git a/internal/descfmt/desc_test.go b/internal/descfmt/desc_test.go
index 96000fe..6d683b2 100644
--- a/internal/descfmt/desc_test.go
+++ b/internal/descfmt/desc_test.go
@@ -22,6 +22,9 @@
 		"ProtoInternal": true,
 		"ProtoType":     true,
 
+		"HasOptionalKeyword": true, // captured by HasPresence
+		"IsSynthetic":        true, // captured by HasPresence
+
 		"SourceLocations":       true, // specific to FileDescriptor
 		"ExtensionRangeOptions": true, // specific to MessageDescriptor
 		"DefaultEnumValue":      true, // specific to FieldDescriptor
diff --git a/internal/descfmt/stringer.go b/internal/descfmt/stringer.go
index 4cb8d6d..e7af0fe 100644
--- a/internal/descfmt/stringer.go
+++ b/internal/descfmt/stringer.go
@@ -106,7 +106,7 @@
 var descriptorAccessors = map[reflect.Type][]string{
 	reflect.TypeOf((*pref.FileDescriptor)(nil)).Elem():      {"Path", "Package", "Imports", "Messages", "Enums", "Extensions", "Services"},
 	reflect.TypeOf((*pref.MessageDescriptor)(nil)).Elem():   {"IsMapEntry", "Fields", "Oneofs", "ReservedNames", "ReservedRanges", "RequiredNumbers", "ExtensionRanges", "Messages", "Enums", "Extensions"},
-	reflect.TypeOf((*pref.FieldDescriptor)(nil)).Elem():     {"Number", "Cardinality", "Kind", "HasJSONName", "JSONName", "IsPacked", "IsExtension", "IsWeak", "IsList", "IsMap", "MapKey", "MapValue", "HasDefault", "Default", "ContainingOneof", "ContainingMessage", "Message", "Enum"},
+	reflect.TypeOf((*pref.FieldDescriptor)(nil)).Elem():     {"Number", "Cardinality", "Kind", "HasJSONName", "JSONName", "HasPresence", "IsExtension", "IsPacked", "IsWeak", "IsList", "IsMap", "MapKey", "MapValue", "HasDefault", "Default", "ContainingOneof", "ContainingMessage", "Message", "Enum"},
 	reflect.TypeOf((*pref.OneofDescriptor)(nil)).Elem():     {"Fields"}, // not directly used; must keep in sync with formatDescOpt
 	reflect.TypeOf((*pref.EnumDescriptor)(nil)).Elem():      {"Values", "ReservedNames", "ReservedRanges"},
 	reflect.TypeOf((*pref.EnumValueDescriptor)(nil)).Elem(): {"Number"},
diff --git a/internal/fieldnum/descriptor_gen.go b/internal/fieldnum/descriptor_gen.go
index 1629515..6e37b59 100644
--- a/internal/fieldnum/descriptor_gen.go
+++ b/internal/fieldnum/descriptor_gen.go
@@ -61,16 +61,17 @@
 
 // Field numbers for google.protobuf.FieldDescriptorProto.
 const (
-	FieldDescriptorProto_Name         = 1  // optional string
-	FieldDescriptorProto_Number       = 3  // optional int32
-	FieldDescriptorProto_Label        = 4  // optional google.protobuf.FieldDescriptorProto.Label
-	FieldDescriptorProto_Type         = 5  // optional google.protobuf.FieldDescriptorProto.Type
-	FieldDescriptorProto_TypeName     = 6  // optional string
-	FieldDescriptorProto_Extendee     = 2  // optional string
-	FieldDescriptorProto_DefaultValue = 7  // optional string
-	FieldDescriptorProto_OneofIndex   = 9  // optional int32
-	FieldDescriptorProto_JsonName     = 10 // optional string
-	FieldDescriptorProto_Options      = 8  // optional google.protobuf.FieldOptions
+	FieldDescriptorProto_Name           = 1  // optional string
+	FieldDescriptorProto_Number         = 3  // optional int32
+	FieldDescriptorProto_Label          = 4  // optional google.protobuf.FieldDescriptorProto.Label
+	FieldDescriptorProto_Type           = 5  // optional google.protobuf.FieldDescriptorProto.Type
+	FieldDescriptorProto_TypeName       = 6  // optional string
+	FieldDescriptorProto_Extendee       = 2  // optional string
+	FieldDescriptorProto_DefaultValue   = 7  // optional string
+	FieldDescriptorProto_OneofIndex     = 9  // optional int32
+	FieldDescriptorProto_JsonName       = 10 // optional string
+	FieldDescriptorProto_Options        = 8  // optional google.protobuf.FieldOptions
+	FieldDescriptorProto_Proto3Optional = 17 // optional bool
 )
 
 // Field numbers for google.protobuf.OneofDescriptorProto.
diff --git a/internal/fieldsort/fieldsort.go b/internal/fieldsort/fieldsort.go
index 1cb2d74..517c4e2 100644
--- a/internal/fieldsort/fieldsort.go
+++ b/internal/fieldsort/fieldsort.go
@@ -30,9 +30,9 @@
 			return a.Number() < b.Number()
 		}
 		return oa.Index() < ob.Index()
-	case oa != nil:
+	case oa != nil && !oa.IsSynthetic():
 		return false
-	case ob != nil:
+	case ob != nil && !ob.IsSynthetic():
 		return true
 	default:
 		return a.Number() < b.Number()
diff --git a/internal/filedesc/build_test.go b/internal/filedesc/build_test.go
index 1404af6..f8007a0 100644
--- a/internal/filedesc/build_test.go
+++ b/internal/filedesc/build_test.go
@@ -54,6 +54,9 @@
 		descPkg.Append("FileDescriptorProto.source_code_info"): true,
 		descPkg.Append("FileDescriptorProto.syntax"):           true,
 
+		// Impossible to test proto3 optional in a proto2 file.
+		descPkg.Append("FieldDescriptorProto.proto3_optional"): true,
+
 		// TODO: Test oneof and extension options. Testing these requires extending the
 		// options messages (because they contain no user-settable fields), but importing
 		// decriptor.proto from test.proto currently causes an import cycle. Add test
diff --git a/internal/filedesc/desc.go b/internal/filedesc/desc.go
index a9fe07c..13b7723 100644
--- a/internal/filedesc/desc.go
+++ b/internal/filedesc/desc.go
@@ -77,7 +77,7 @@
 func (fd *File) Messages() pref.MessageDescriptors     { return &fd.L1.Messages }
 func (fd *File) Extensions() pref.ExtensionDescriptors { return &fd.L1.Extensions }
 func (fd *File) Services() pref.ServiceDescriptors     { return &fd.L1.Services }
-func (fd *File) SourceLocations() pref.SourceLocations { return &fd.L2.Locations }
+func (fd *File) SourceLocations() pref.SourceLocations { return &fd.lazyInit().Locations }
 func (fd *File) Format(s fmt.State, r rune)            { descfmt.FormatDesc(s, r, fd) }
 func (fd *File) ProtoType(pref.FileDescriptor)         {}
 func (fd *File) ProtoInternal(pragma.DoNotImplement)   {}
@@ -202,20 +202,21 @@
 		L1 FieldL1
 	}
 	FieldL1 struct {
-		Options         func() pref.ProtoMessage
-		Number          pref.FieldNumber
-		Cardinality     pref.Cardinality // must be consistent with Message.RequiredNumbers
-		Kind            pref.Kind
-		JSONName        jsonName
-		IsWeak          bool // promoted from google.protobuf.FieldOptions
-		HasPacked       bool // promoted from google.protobuf.FieldOptions
-		IsPacked        bool // promoted from google.protobuf.FieldOptions
-		HasEnforceUTF8  bool // promoted from google.protobuf.FieldOptions
-		EnforceUTF8     bool // promoted from google.protobuf.FieldOptions
-		Default         defaultValue
-		ContainingOneof pref.OneofDescriptor // must be consistent with Message.Oneofs.Fields
-		Enum            pref.EnumDescriptor
-		Message         pref.MessageDescriptor
+		Options          func() pref.ProtoMessage
+		Number           pref.FieldNumber
+		Cardinality      pref.Cardinality // must be consistent with Message.RequiredNumbers
+		Kind             pref.Kind
+		JSONName         jsonName
+		IsProto3Optional bool // promoted from google.protobuf.FieldDescriptorProto
+		IsWeak           bool // promoted from google.protobuf.FieldOptions
+		HasPacked        bool // promoted from google.protobuf.FieldOptions
+		IsPacked         bool // promoted from google.protobuf.FieldOptions
+		HasEnforceUTF8   bool // promoted from google.protobuf.FieldOptions
+		EnforceUTF8      bool // promoted from google.protobuf.FieldOptions
+		Default          defaultValue
+		ContainingOneof  pref.OneofDescriptor // must be consistent with Message.Oneofs.Fields
+		Enum             pref.EnumDescriptor
+		Message          pref.MessageDescriptor
 	}
 
 	Oneof struct {
@@ -277,6 +278,12 @@
 func (fd *Field) Kind() pref.Kind               { return fd.L1.Kind }
 func (fd *Field) HasJSONName() bool             { return fd.L1.JSONName.has }
 func (fd *Field) JSONName() string              { return fd.L1.JSONName.get(fd) }
+func (fd *Field) HasPresence() bool {
+	return fd.L1.Cardinality != pref.Repeated && (fd.L0.ParentFile.L1.Syntax == pref.Proto2 || fd.L1.Message != nil || fd.L1.ContainingOneof != nil)
+}
+func (fd *Field) HasOptionalKeyword() bool {
+	return (fd.L0.ParentFile.L1.Syntax == pref.Proto2 && fd.L1.Cardinality == pref.Optional && fd.L1.ContainingOneof == nil) || fd.L1.IsProto3Optional
+}
 func (fd *Field) IsPacked() bool {
 	if !fd.L1.HasPacked && fd.L0.ParentFile.L1.Syntax != pref.Proto2 && fd.L1.Cardinality == pref.Repeated {
 		switch fd.L1.Kind {
@@ -338,6 +345,9 @@
 	return fd.L0.ParentFile.L1.Syntax == pref.Proto3
 }
 
+func (od *Oneof) IsSynthetic() bool {
+	return od.L0.ParentFile.L1.Syntax == pref.Proto3 && len(od.L1.Fields.List) == 1 && od.L1.Fields.List[0].HasOptionalKeyword()
+}
 func (od *Oneof) Options() pref.ProtoMessage {
 	if f := od.L1.Options; f != nil {
 		return f()
@@ -361,12 +371,13 @@
 		Kind        pref.Kind
 	}
 	ExtensionL2 struct {
-		Options  func() pref.ProtoMessage
-		JSONName jsonName
-		IsPacked bool // promoted from google.protobuf.FieldOptions
-		Default  defaultValue
-		Enum     pref.EnumDescriptor
-		Message  pref.MessageDescriptor
+		Options          func() pref.ProtoMessage
+		JSONName         jsonName
+		IsProto3Optional bool // promoted from google.protobuf.FieldDescriptorProto
+		IsPacked         bool // promoted from google.protobuf.FieldOptions
+		Default          defaultValue
+		Enum             pref.EnumDescriptor
+		Message          pref.MessageDescriptor
 	}
 )
 
@@ -376,11 +387,15 @@
 	}
 	return descopts.Field
 }
-func (xd *Extension) Number() pref.FieldNumber                   { return xd.L1.Number }
-func (xd *Extension) Cardinality() pref.Cardinality              { return xd.L1.Cardinality }
-func (xd *Extension) Kind() pref.Kind                            { return xd.L1.Kind }
-func (xd *Extension) HasJSONName() bool                          { return xd.lazyInit().JSONName.has }
-func (xd *Extension) JSONName() string                           { return xd.lazyInit().JSONName.get(xd) }
+func (xd *Extension) Number() pref.FieldNumber      { return xd.L1.Number }
+func (xd *Extension) Cardinality() pref.Cardinality { return xd.L1.Cardinality }
+func (xd *Extension) Kind() pref.Kind               { return xd.L1.Kind }
+func (xd *Extension) HasJSONName() bool             { return xd.lazyInit().JSONName.has }
+func (xd *Extension) JSONName() string              { return xd.lazyInit().JSONName.get(xd) }
+func (xd *Extension) HasPresence() bool             { return xd.L1.Cardinality != pref.Repeated }
+func (xd *Extension) HasOptionalKeyword() bool {
+	return (xd.L0.ParentFile.L1.Syntax == pref.Proto2 && xd.L1.Cardinality == pref.Optional) || xd.lazyInit().IsProto3Optional
+}
 func (xd *Extension) IsPacked() bool                             { return xd.lazyInit().IsPacked }
 func (xd *Extension) IsExtension() bool                          { return true }
 func (xd *Extension) IsWeak() bool                               { return false }
diff --git a/internal/filedesc/desc_lazy.go b/internal/filedesc/desc_lazy.go
index cdf3164..bc21594 100644
--- a/internal/filedesc/desc_lazy.go
+++ b/internal/filedesc/desc_lazy.go
@@ -441,6 +441,8 @@
 					panic("oneof type already set")
 				}
 				fd.L1.ContainingOneof = od
+			case fieldnum.FieldDescriptorProto_Proto3Optional:
+				fd.L1.IsProto3Optional = protowire.DecodeBool(v)
 			}
 		case protowire.BytesType:
 			v, m := protowire.ConsumeBytes(b)
@@ -537,6 +539,13 @@
 		num, typ, n := protowire.ConsumeTag(b)
 		b = b[n:]
 		switch typ {
+		case protowire.VarintType:
+			v, m := protowire.ConsumeVarint(b)
+			b = b[m:]
+			switch num {
+			case fieldnum.FieldDescriptorProto_Proto3Optional:
+				xd.L2.IsProto3Optional = protowire.DecodeBool(v)
+			}
 		case protowire.BytesType:
 			v, m := protowire.ConsumeBytes(b)
 			b = b[m:]
diff --git a/internal/filedesc/desc_test.go b/internal/filedesc/desc_test.go
index 57a693c..4aef0fb 100644
--- a/internal/filedesc/desc_test.go
+++ b/internal/filedesc/desc_test.go
@@ -614,6 +614,7 @@
 			Cardinality: optional
 			Kind:        string
 			JSONName:    "fieldOne"
+			HasPresence: true
 			HasDefault:  true
 			Default:     "hello, \"world!\"\n"
 			Oneof:       O1
@@ -624,6 +625,7 @@
 			Kind:        enum
 			HasJSONName: true
 			JSONName:    "Field2"
+			HasPresence: true
 			HasDefault:  true
 			Default:     1
 			Oneof:       O2
@@ -634,6 +636,7 @@
 			Cardinality: optional
 			Kind:        message
 			JSONName:    "fieldThree"
+			HasPresence: true
 			Oneof:       O2
 			Message:     test.C
 		}, {
@@ -660,6 +663,7 @@
 			Cardinality: required
 			Kind:        bytes
 			JSONName:    "fieldSix"
+			HasPresence: true
 		}]
 		Oneofs: [{
 			Name:   O1
@@ -681,12 +685,14 @@
 				Cardinality: optional
 				Kind:        string
 				JSONName:    "key"
+				HasPresence: true
 			}, {
 				Name:        value
 				Number:      2
 				Cardinality: optional
 				Kind:        message
 				JSONName:    "value"
+				HasPresence: true
 				Message:     test.B
 			}]
 		}]
@@ -700,6 +706,7 @@
 				Cardinality: required
 				Kind:        bytes
 				JSONName:    "F"
+				HasPresence: true
 				HasDefault:  true
 				Default:     "dead\xbe\xef"
 			}]
@@ -739,8 +746,8 @@
 		Cardinality: repeated
 		Kind:        enum
 		JSONName:    "X"
-		IsPacked:    true
 		IsExtension: true
+		IsPacked:    true
 		IsList:      true
 		Extendee:    test.B
 		Enum:        test.E1
diff --git a/internal/impl/codec_message.go b/internal/impl/codec_message.go
index 5259f2f..29ed59b 100644
--- a/internal/impl/codec_message.go
+++ b/internal/impl/codec_message.go
@@ -63,7 +63,8 @@
 		fd := fields.Get(i)
 
 		fs := si.fieldsByNumber[fd.Number()]
-		if fd.ContainingOneof() != nil {
+		isOneof := fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic()
+		if isOneof {
 			fs = si.oneofsByName[fd.ContainingOneof().Name()]
 		}
 		ft := fs.Type
@@ -77,7 +78,7 @@
 		var funcs pointerCoderFuncs
 		var childMessage *MessageInfo
 		switch {
-		case fd.ContainingOneof() != nil:
+		case isOneof:
 			fieldOffset = offsetOf(fs, mi.Exporter)
 		case fd.IsWeak():
 			fieldOffset = si.weakOffset
@@ -102,17 +103,16 @@
 			funcs:      funcs,
 			mi:         childMessage,
 			validation: newFieldValidationInfo(mi, si, fd, ft),
-			isPointer: (fd.Cardinality() == pref.Repeated ||
-				fd.Kind() == pref.MessageKind ||
-				fd.Kind() == pref.GroupKind ||
-				fd.Syntax() != pref.Proto3),
+			isPointer:  fd.Cardinality() == pref.Repeated || fd.HasPresence(),
 			isRequired: fd.Cardinality() == pref.Required,
 		}
 		mi.orderedCoderFields = append(mi.orderedCoderFields, cf)
 		mi.coderFields[cf.num] = cf
 	}
 	for i, oneofs := 0, mi.Desc.Oneofs(); i < oneofs.Len(); i++ {
-		mi.initOneofFieldCoders(oneofs.Get(i), si)
+		if od := oneofs.Get(i); !od.IsSynthetic() {
+			mi.initOneofFieldCoders(od, si)
+		}
 	}
 	if messageset.IsMessageSet(mi.Desc) {
 		if !mi.extensionOffset.IsValid() {
diff --git a/internal/impl/legacy_extension.go b/internal/impl/legacy_extension.go
index 93c318f..61757ce 100644
--- a/internal/impl/legacy_extension.go
+++ b/internal/impl/legacy_extension.go
@@ -155,6 +155,8 @@
 func (x placeholderExtension) Kind() pref.Kind                            { return 0 }
 func (x placeholderExtension) HasJSONName() bool                          { return false }
 func (x placeholderExtension) JSONName() string                           { return "" }
+func (x placeholderExtension) HasPresence() bool                          { return false }
+func (x placeholderExtension) HasOptionalKeyword() bool                   { return false }
 func (x placeholderExtension) IsExtension() bool                          { return true }
 func (x placeholderExtension) IsWeak() bool                               { return false }
 func (x placeholderExtension) IsPacked() bool                             { return false }
diff --git a/internal/impl/message_reflect.go b/internal/impl/message_reflect.go
index 28114ff..3eb2b13 100644
--- a/internal/impl/message_reflect.go
+++ b/internal/impl/message_reflect.go
@@ -53,7 +53,7 @@
 		fs := si.fieldsByNumber[fd.Number()]
 		var fi fieldInfo
 		switch {
-		case fd.ContainingOneof() != nil:
+		case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
 			fi = fieldInfoForOneof(fd, si.oneofsByName[fd.ContainingOneof().Name()], mi.Exporter, si.oneofWrappersByNumber[fd.Number()])
 		case fd.IsMap():
 			fi = fieldInfoForMap(fd, fs, mi.Exporter)
@@ -72,7 +72,7 @@
 	mi.oneofs = map[pref.Name]*oneofInfo{}
 	for i := 0; i < md.Oneofs().Len(); i++ {
 		od := md.Oneofs().Get(i)
-		mi.oneofs[od.Name()] = makeOneofInfo(od, si.oneofsByName[od.Name()], mi.Exporter, si.oneofWrappersByType)
+		mi.oneofs[od.Name()] = makeOneofInfo(od, si, mi.Exporter)
 	}
 
 	mi.denseFields = make([]*fieldInfo, fds.Len()*2)
@@ -84,7 +84,7 @@
 
 	for i := 0; i < fds.Len(); {
 		fd := fds.Get(i)
-		if od := fd.ContainingOneof(); od != nil {
+		if od := fd.ContainingOneof(); od != nil && !od.IsSynthetic() {
 			mi.rangeInfos = append(mi.rangeInfos, mi.oneofs[od.Name()])
 			i += od.Fields().Len()
 		} else {
diff --git a/internal/impl/message_reflect_field.go b/internal/impl/message_reflect_field.go
index 7b87d47..ea6f755 100644
--- a/internal/impl/message_reflect_field.go
+++ b/internal/impl/message_reflect_field.go
@@ -221,7 +221,7 @@
 
 func fieldInfoForScalar(fd pref.FieldDescriptor, fs reflect.StructField, x exporter) fieldInfo {
 	ft := fs.Type
-	nullable := fd.Syntax() == pref.Proto2
+	nullable := fd.HasPresence()
 	isBytes := ft.Kind() == reflect.Slice && ft.Elem().Kind() == reflect.Uint8
 	if nullable {
 		if ft.Kind() != reflect.Ptr && ft.Kind() != reflect.Slice {
@@ -290,9 +290,9 @@
 			rv.Set(conv.GoValueOf(v))
 			if isBytes && rv.Len() == 0 {
 				if nullable {
-					rv.Set(emptyBytes) // preserve presence in proto2
+					rv.Set(emptyBytes) // preserve presence
 				} else {
-					rv.Set(nilBytes) // do not preserve presence in proto3
+					rv.Set(nilBytes) // do not preserve presence
 				}
 			}
 		},
@@ -426,11 +426,25 @@
 	which     func(pointer) pref.FieldNumber
 }
 
-func makeOneofInfo(od pref.OneofDescriptor, fs reflect.StructField, x exporter, wrappersByType map[reflect.Type]pref.FieldNumber) *oneofInfo {
-	fieldOffset := offsetOf(fs, x)
-	return &oneofInfo{
-		oneofDesc: od,
-		which: func(p pointer) pref.FieldNumber {
+func makeOneofInfo(od pref.OneofDescriptor, si structInfo, x exporter) *oneofInfo {
+	oi := &oneofInfo{oneofDesc: od}
+	if od.IsSynthetic() {
+		fs := si.fieldsByNumber[od.Fields().Get(0).Number()]
+		fieldOffset := offsetOf(fs, x)
+		oi.which = func(p pointer) pref.FieldNumber {
+			if p.IsNil() {
+				return 0
+			}
+			rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
+			if rv.IsNil() { // valid on either *T or []byte
+				return 0
+			}
+			return od.Fields().Get(0).Number()
+		}
+	} else {
+		fs := si.oneofsByName[od.Name()]
+		fieldOffset := offsetOf(fs, x)
+		oi.which = func(p pointer) pref.FieldNumber {
 			if p.IsNil() {
 				return 0
 			}
@@ -442,7 +456,8 @@
 			if rv.IsNil() {
 				return 0
 			}
-			return wrappersByType[rv.Type().Elem()]
-		},
+			return si.oneofWrappersByType[rv.Type().Elem()]
+		}
 	}
+	return oi
 }
diff --git a/internal/impl/validate.go b/internal/impl/validate.go
index 39d62fd..57de9cc 100644
--- a/internal/impl/validate.go
+++ b/internal/impl/validate.go
@@ -108,7 +108,7 @@
 func newFieldValidationInfo(mi *MessageInfo, si structInfo, fd pref.FieldDescriptor, ft reflect.Type) validationInfo {
 	var vi validationInfo
 	switch {
-	case fd.ContainingOneof() != nil:
+	case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
 		switch fd.Kind() {
 		case pref.MessageKind:
 			vi.typ = validationTypeMessage
diff --git a/internal/testprotos/benchmarks/datasets/google_message1/proto2/benchmark_message1_proto2.pb.go b/internal/testprotos/benchmarks/datasets/google_message1/proto2/benchmark_message1_proto2.pb.go
index d27c4d9..df9149c 100644
--- a/internal/testprotos/benchmarks/datasets/google_message1/proto2/benchmark_message1_proto2.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message1/proto2/benchmark_message1_proto2.pb.go
@@ -1,3 +1,33 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 // Benchmark messages for proto2.
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
diff --git a/internal/testprotos/benchmarks/datasets/google_message1/proto3/benchmark_message1_proto3.pb.go b/internal/testprotos/benchmarks/datasets/google_message1/proto3/benchmark_message1_proto3.pb.go
index 469f548..a264895 100644
--- a/internal/testprotos/benchmarks/datasets/google_message1/proto3/benchmark_message1_proto3.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message1/proto3/benchmark_message1_proto3.pb.go
@@ -1,3 +1,33 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 // Benchmark messages for proto3.
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
diff --git a/internal/testprotos/benchmarks/datasets/google_message2/benchmark_message2.pb.go b/internal/testprotos/benchmarks/datasets/google_message2/benchmark_message2.pb.go
index 394925f..d9ad8c7 100644
--- a/internal/testprotos/benchmarks/datasets/google_message2/benchmark_message2.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message2/benchmark_message2.pb.go
@@ -1,3 +1,35 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
 // Benchmark messages for proto2.
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
diff --git a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3.pb.go b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3.pb.go
index e4d55bc..977fa61 100644
--- a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3.pb.go
@@ -1,3 +1,35 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message3/benchmark_message3.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_1.pb.go b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_1.pb.go
index 16360d4..131f7a6 100644
--- a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_1.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_1.pb.go
@@ -1,3 +1,35 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message3/benchmark_message3_1.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_2.pb.go b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_2.pb.go
index 0dbe65b..99ed73f 100644
--- a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_2.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_2.pb.go
@@ -1,3 +1,35 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message3/benchmark_message3_2.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_3.pb.go b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_3.pb.go
index 942609d..fe4ff23 100644
--- a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_3.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_3.pb.go
@@ -1,3 +1,35 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message3/benchmark_message3_3.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_4.pb.go b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_4.pb.go
index 377228c..b23548a 100644
--- a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_4.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_4.pb.go
@@ -1,3 +1,35 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message3/benchmark_message3_4.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_5.pb.go b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_5.pb.go
index 47ade5c..789650c 100644
--- a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_5.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_5.pb.go
@@ -1,3 +1,35 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message3/benchmark_message3_5.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_6.pb.go b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_6.pb.go
index 02faa52..f0f9740 100644
--- a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_6.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_6.pb.go
@@ -1,3 +1,35 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message3/benchmark_message3_6.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_7.pb.go b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_7.pb.go
index 4a1a647..758392f 100644
--- a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_7.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_7.pb.go
@@ -1,3 +1,33 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message3/benchmark_message3_7.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_8.pb.go b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_8.pb.go
index f7f9959..5fbb6b8 100644
--- a/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_8.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message3/benchmark_message3_8.pb.go
@@ -1,3 +1,33 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message3/benchmark_message3_8.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4.pb.go b/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4.pb.go
index 3e456e9..4d6ef26 100644
--- a/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4.pb.go
@@ -1,3 +1,35 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message4/benchmark_message4.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_1.pb.go b/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_1.pb.go
index 28d0fbd..c57dd68 100644
--- a/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_1.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_1.pb.go
@@ -1,3 +1,35 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// LINT: ALLOW_GROUPS
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message4/benchmark_message4_1.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_2.pb.go b/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_2.pb.go
index 33851ad..dde28c0 100644
--- a/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_2.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_2.pb.go
@@ -1,3 +1,33 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message4/benchmark_message4_2.proto
 
diff --git a/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_3.pb.go b/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_3.pb.go
index fa5b216..0bf6b28 100644
--- a/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_3.pb.go
+++ b/internal/testprotos/benchmarks/datasets/google_message4/benchmark_message4_3.pb.go
@@ -1,3 +1,33 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: datasets/google_message4/benchmark_message4_3.proto
 
diff --git a/internal/testprotos/conformance/conformance.pb.go b/internal/testprotos/conformance/conformance.pb.go
index 65f0f2d..9922a85 100644
--- a/internal/testprotos/conformance/conformance.pb.go
+++ b/internal/testprotos/conformance/conformance.pb.go
@@ -242,7 +242,7 @@
 	// protobuf_test_messages.proto2.TestAllTypesProto2.
 	MessageType string `protobuf:"bytes,4,opt,name=message_type,json=messageType,proto3" json:"message_type,omitempty"`
 	// Each test is given a specific test category. Some category may need
-	// spedific support in testee programs. Refer to the defintion of TestCategory
+	// spedific support in testee programs. Refer to the definition of TestCategory
 	// for more information.
 	TestCategory TestCategory `protobuf:"varint,5,opt,name=test_category,json=testCategory,proto3,enum=conformance.TestCategory" json:"test_category,omitempty"`
 	// Specify details for how to encode jspb.
@@ -576,7 +576,7 @@
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Encode the value field of Any as jspb array if ture, otherwise binary.
+	// Encode the value field of Any as jspb array if true, otherwise binary.
 	UseJspbArrayAnyFormat bool `protobuf:"varint,1,opt,name=use_jspb_array_any_format,json=useJspbArrayAnyFormat,proto3" json:"use_jspb_array_any_format,omitempty"`
 }
 
diff --git a/internal/testprotos/conformance/test_messages_proto2.pb.go b/internal/testprotos/conformance/test_messages_proto2.pb.go
index a8f462b..dafcc84 100644
--- a/internal/testprotos/conformance/test_messages_proto2.pb.go
+++ b/internal/testprotos/conformance/test_messages_proto2.pb.go
@@ -27,36 +27,6 @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 //
 // Test schema for proto2 messages.  This test schema is used by:
 //
diff --git a/internal/testprotos/conformance/test_messages_proto3.pb.go b/internal/testprotos/conformance/test_messages_proto3.pb.go
index 96b24c6..b356b5b 100644
--- a/internal/testprotos/conformance/test_messages_proto3.pb.go
+++ b/internal/testprotos/conformance/test_messages_proto3.pb.go
@@ -27,36 +27,6 @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 //
 // Test schema for proto3 messages.  This test schema is used by:
 //
diff --git a/internal/testprotos/test3/test.pb.go b/internal/testprotos/test3/test.pb.go
index 9e5553c..6375d8f 100644
--- a/internal/testprotos/test3/test.pb.go
+++ b/internal/testprotos/test3/test.pb.go
@@ -123,27 +123,48 @@
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	OptionalInt32          int32                                  `protobuf:"varint,1,opt,name=optional_int32,json=optionalInt32,proto3" json:"optional_int32,omitempty"`
-	OptionalInt64          int64                                  `protobuf:"varint,2,opt,name=optional_int64,json=optionalInt64,proto3" json:"optional_int64,omitempty"`
-	OptionalUint32         uint32                                 `protobuf:"varint,3,opt,name=optional_uint32,json=optionalUint32,proto3" json:"optional_uint32,omitempty"`
-	OptionalUint64         uint64                                 `protobuf:"varint,4,opt,name=optional_uint64,json=optionalUint64,proto3" json:"optional_uint64,omitempty"`
-	OptionalSint32         int32                                  `protobuf:"zigzag32,5,opt,name=optional_sint32,json=optionalSint32,proto3" json:"optional_sint32,omitempty"`
-	OptionalSint64         int64                                  `protobuf:"zigzag64,6,opt,name=optional_sint64,json=optionalSint64,proto3" json:"optional_sint64,omitempty"`
-	OptionalFixed32        uint32                                 `protobuf:"fixed32,7,opt,name=optional_fixed32,json=optionalFixed32,proto3" json:"optional_fixed32,omitempty"`
-	OptionalFixed64        uint64                                 `protobuf:"fixed64,8,opt,name=optional_fixed64,json=optionalFixed64,proto3" json:"optional_fixed64,omitempty"`
-	OptionalSfixed32       int32                                  `protobuf:"fixed32,9,opt,name=optional_sfixed32,json=optionalSfixed32,proto3" json:"optional_sfixed32,omitempty"`
-	OptionalSfixed64       int64                                  `protobuf:"fixed64,10,opt,name=optional_sfixed64,json=optionalSfixed64,proto3" json:"optional_sfixed64,omitempty"`
-	OptionalFloat          float32                                `protobuf:"fixed32,11,opt,name=optional_float,json=optionalFloat,proto3" json:"optional_float,omitempty"`
-	OptionalDouble         float64                                `protobuf:"fixed64,12,opt,name=optional_double,json=optionalDouble,proto3" json:"optional_double,omitempty"`
-	OptionalBool           bool                                   `protobuf:"varint,13,opt,name=optional_bool,json=optionalBool,proto3" json:"optional_bool,omitempty"`
-	OptionalString         string                                 `protobuf:"bytes,14,opt,name=optional_string,json=optionalString,proto3" json:"optional_string,omitempty"`
-	OptionalBytes          []byte                                 `protobuf:"bytes,15,opt,name=optional_bytes,json=optionalBytes,proto3" json:"optional_bytes,omitempty"`
-	OptionalNestedMessage  *TestAllTypes_NestedMessage            `protobuf:"bytes,18,opt,name=optional_nested_message,json=optionalNestedMessage,proto3" json:"optional_nested_message,omitempty"`
-	OptionalForeignMessage *ForeignMessage                        `protobuf:"bytes,19,opt,name=optional_foreign_message,json=optionalForeignMessage,proto3" json:"optional_foreign_message,omitempty"`
-	OptionalImportMessage  *ImportMessage                         `protobuf:"bytes,20,opt,name=optional_import_message,json=optionalImportMessage,proto3" json:"optional_import_message,omitempty"`
-	OptionalNestedEnum     TestAllTypes_NestedEnum                `protobuf:"varint,21,opt,name=optional_nested_enum,json=optionalNestedEnum,proto3,enum=goproto.proto.test3.TestAllTypes_NestedEnum" json:"optional_nested_enum,omitempty"`
-	OptionalForeignEnum    ForeignEnum                            `protobuf:"varint,22,opt,name=optional_foreign_enum,json=optionalForeignEnum,proto3,enum=goproto.proto.test3.ForeignEnum" json:"optional_foreign_enum,omitempty"`
-	OptionalImportEnum     ImportEnum                             `protobuf:"varint,23,opt,name=optional_import_enum,json=optionalImportEnum,proto3,enum=goproto.proto.test3.ImportEnum" json:"optional_import_enum,omitempty"`
+	SingularInt32          int32                                  `protobuf:"varint,81,opt,name=singular_int32,json=singularInt32,proto3" json:"singular_int32,omitempty"`
+	SingularInt64          int64                                  `protobuf:"varint,82,opt,name=singular_int64,json=singularInt64,proto3" json:"singular_int64,omitempty"`
+	SingularUint32         uint32                                 `protobuf:"varint,83,opt,name=singular_uint32,json=singularUint32,proto3" json:"singular_uint32,omitempty"`
+	SingularUint64         uint64                                 `protobuf:"varint,84,opt,name=singular_uint64,json=singularUint64,proto3" json:"singular_uint64,omitempty"`
+	SingularSint32         int32                                  `protobuf:"zigzag32,85,opt,name=singular_sint32,json=singularSint32,proto3" json:"singular_sint32,omitempty"`
+	SingularSint64         int64                                  `protobuf:"zigzag64,86,opt,name=singular_sint64,json=singularSint64,proto3" json:"singular_sint64,omitempty"`
+	SingularFixed32        uint32                                 `protobuf:"fixed32,87,opt,name=singular_fixed32,json=singularFixed32,proto3" json:"singular_fixed32,omitempty"`
+	SingularFixed64        uint64                                 `protobuf:"fixed64,88,opt,name=singular_fixed64,json=singularFixed64,proto3" json:"singular_fixed64,omitempty"`
+	SingularSfixed32       int32                                  `protobuf:"fixed32,89,opt,name=singular_sfixed32,json=singularSfixed32,proto3" json:"singular_sfixed32,omitempty"`
+	SingularSfixed64       int64                                  `protobuf:"fixed64,90,opt,name=singular_sfixed64,json=singularSfixed64,proto3" json:"singular_sfixed64,omitempty"`
+	SingularFloat          float32                                `protobuf:"fixed32,91,opt,name=singular_float,json=singularFloat,proto3" json:"singular_float,omitempty"`
+	SingularDouble         float64                                `protobuf:"fixed64,92,opt,name=singular_double,json=singularDouble,proto3" json:"singular_double,omitempty"`
+	SingularBool           bool                                   `protobuf:"varint,93,opt,name=singular_bool,json=singularBool,proto3" json:"singular_bool,omitempty"`
+	SingularString         string                                 `protobuf:"bytes,94,opt,name=singular_string,json=singularString,proto3" json:"singular_string,omitempty"`
+	SingularBytes          []byte                                 `protobuf:"bytes,95,opt,name=singular_bytes,json=singularBytes,proto3" json:"singular_bytes,omitempty"`
+	SingularNestedMessage  *TestAllTypes_NestedMessage            `protobuf:"bytes,98,opt,name=singular_nested_message,json=singularNestedMessage,proto3" json:"singular_nested_message,omitempty"`
+	SingularForeignMessage *ForeignMessage                        `protobuf:"bytes,99,opt,name=singular_foreign_message,json=singularForeignMessage,proto3" json:"singular_foreign_message,omitempty"`
+	SingularImportMessage  *ImportMessage                         `protobuf:"bytes,100,opt,name=singular_import_message,json=singularImportMessage,proto3" json:"singular_import_message,omitempty"`
+	SingularNestedEnum     TestAllTypes_NestedEnum                `protobuf:"varint,101,opt,name=singular_nested_enum,json=singularNestedEnum,proto3,enum=goproto.proto.test3.TestAllTypes_NestedEnum" json:"singular_nested_enum,omitempty"`
+	SingularForeignEnum    ForeignEnum                            `protobuf:"varint,102,opt,name=singular_foreign_enum,json=singularForeignEnum,proto3,enum=goproto.proto.test3.ForeignEnum" json:"singular_foreign_enum,omitempty"`
+	SingularImportEnum     ImportEnum                             `protobuf:"varint,103,opt,name=singular_import_enum,json=singularImportEnum,proto3,enum=goproto.proto.test3.ImportEnum" json:"singular_import_enum,omitempty"`
+	OptionalInt32          *int32                                 `protobuf:"varint,1,opt,name=optional_int32,json=optionalInt32,proto3,oneof" json:"optional_int32,omitempty"`
+	OptionalInt64          *int64                                 `protobuf:"varint,2,opt,name=optional_int64,json=optionalInt64,proto3,oneof" json:"optional_int64,omitempty"`
+	OptionalUint32         *uint32                                `protobuf:"varint,3,opt,name=optional_uint32,json=optionalUint32,proto3,oneof" json:"optional_uint32,omitempty"`
+	OptionalUint64         *uint64                                `protobuf:"varint,4,opt,name=optional_uint64,json=optionalUint64,proto3,oneof" json:"optional_uint64,omitempty"`
+	OptionalSint32         *int32                                 `protobuf:"zigzag32,5,opt,name=optional_sint32,json=optionalSint32,proto3,oneof" json:"optional_sint32,omitempty"`
+	OptionalSint64         *int64                                 `protobuf:"zigzag64,6,opt,name=optional_sint64,json=optionalSint64,proto3,oneof" json:"optional_sint64,omitempty"`
+	OptionalFixed32        *uint32                                `protobuf:"fixed32,7,opt,name=optional_fixed32,json=optionalFixed32,proto3,oneof" json:"optional_fixed32,omitempty"`
+	OptionalFixed64        *uint64                                `protobuf:"fixed64,8,opt,name=optional_fixed64,json=optionalFixed64,proto3,oneof" json:"optional_fixed64,omitempty"`
+	OptionalSfixed32       *int32                                 `protobuf:"fixed32,9,opt,name=optional_sfixed32,json=optionalSfixed32,proto3,oneof" json:"optional_sfixed32,omitempty"`
+	OptionalSfixed64       *int64                                 `protobuf:"fixed64,10,opt,name=optional_sfixed64,json=optionalSfixed64,proto3,oneof" json:"optional_sfixed64,omitempty"`
+	OptionalFloat          *float32                               `protobuf:"fixed32,11,opt,name=optional_float,json=optionalFloat,proto3,oneof" json:"optional_float,omitempty"`
+	OptionalDouble         *float64                               `protobuf:"fixed64,12,opt,name=optional_double,json=optionalDouble,proto3,oneof" json:"optional_double,omitempty"`
+	OptionalBool           *bool                                  `protobuf:"varint,13,opt,name=optional_bool,json=optionalBool,proto3,oneof" json:"optional_bool,omitempty"`
+	OptionalString         *string                                `protobuf:"bytes,14,opt,name=optional_string,json=optionalString,proto3,oneof" json:"optional_string,omitempty"`
+	OptionalBytes          []byte                                 `protobuf:"bytes,15,opt,name=optional_bytes,json=optionalBytes,proto3,oneof" json:"optional_bytes,omitempty"`
+	OptionalNestedMessage  *TestAllTypes_NestedMessage            `protobuf:"bytes,18,opt,name=optional_nested_message,json=optionalNestedMessage,proto3,oneof" json:"optional_nested_message,omitempty"`
+	OptionalForeignMessage *ForeignMessage                        `protobuf:"bytes,19,opt,name=optional_foreign_message,json=optionalForeignMessage,proto3,oneof" json:"optional_foreign_message,omitempty"`
+	OptionalImportMessage  *ImportMessage                         `protobuf:"bytes,20,opt,name=optional_import_message,json=optionalImportMessage,proto3,oneof" json:"optional_import_message,omitempty"`
+	OptionalNestedEnum     *TestAllTypes_NestedEnum               `protobuf:"varint,21,opt,name=optional_nested_enum,json=optionalNestedEnum,proto3,enum=goproto.proto.test3.TestAllTypes_NestedEnum,oneof" json:"optional_nested_enum,omitempty"`
+	OptionalForeignEnum    *ForeignEnum                           `protobuf:"varint,22,opt,name=optional_foreign_enum,json=optionalForeignEnum,proto3,enum=goproto.proto.test3.ForeignEnum,oneof" json:"optional_foreign_enum,omitempty"`
+	OptionalImportEnum     *ImportEnum                            `protobuf:"varint,23,opt,name=optional_import_enum,json=optionalImportEnum,proto3,enum=goproto.proto.test3.ImportEnum,oneof" json:"optional_import_enum,omitempty"`
 	RepeatedInt32          []int32                                `protobuf:"varint,31,rep,packed,name=repeated_int32,json=repeatedInt32,proto3" json:"repeated_int32,omitempty"`
 	RepeatedInt64          []int64                                `protobuf:"varint,32,rep,packed,name=repeated_int64,json=repeatedInt64,proto3" json:"repeated_int64,omitempty"`
 	RepeatedUint32         []uint32                               `protobuf:"varint,33,rep,packed,name=repeated_uint32,json=repeatedUint32,proto3" json:"repeated_uint32,omitempty"`
@@ -227,100 +248,247 @@
 	return file_internal_testprotos_test3_test_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *TestAllTypes) GetOptionalInt32() int32 {
+func (x *TestAllTypes) GetSingularInt32() int32 {
 	if x != nil {
-		return x.OptionalInt32
+		return x.SingularInt32
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularInt64() int64 {
+	if x != nil {
+		return x.SingularInt64
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularUint32() uint32 {
+	if x != nil {
+		return x.SingularUint32
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularUint64() uint64 {
+	if x != nil {
+		return x.SingularUint64
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularSint32() int32 {
+	if x != nil {
+		return x.SingularSint32
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularSint64() int64 {
+	if x != nil {
+		return x.SingularSint64
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularFixed32() uint32 {
+	if x != nil {
+		return x.SingularFixed32
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularFixed64() uint64 {
+	if x != nil {
+		return x.SingularFixed64
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularSfixed32() int32 {
+	if x != nil {
+		return x.SingularSfixed32
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularSfixed64() int64 {
+	if x != nil {
+		return x.SingularSfixed64
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularFloat() float32 {
+	if x != nil {
+		return x.SingularFloat
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularDouble() float64 {
+	if x != nil {
+		return x.SingularDouble
+	}
+	return 0
+}
+
+func (x *TestAllTypes) GetSingularBool() bool {
+	if x != nil {
+		return x.SingularBool
+	}
+	return false
+}
+
+func (x *TestAllTypes) GetSingularString() string {
+	if x != nil {
+		return x.SingularString
+	}
+	return ""
+}
+
+func (x *TestAllTypes) GetSingularBytes() []byte {
+	if x != nil {
+		return x.SingularBytes
+	}
+	return nil
+}
+
+func (x *TestAllTypes) GetSingularNestedMessage() *TestAllTypes_NestedMessage {
+	if x != nil {
+		return x.SingularNestedMessage
+	}
+	return nil
+}
+
+func (x *TestAllTypes) GetSingularForeignMessage() *ForeignMessage {
+	if x != nil {
+		return x.SingularForeignMessage
+	}
+	return nil
+}
+
+func (x *TestAllTypes) GetSingularImportMessage() *ImportMessage {
+	if x != nil {
+		return x.SingularImportMessage
+	}
+	return nil
+}
+
+func (x *TestAllTypes) GetSingularNestedEnum() TestAllTypes_NestedEnum {
+	if x != nil {
+		return x.SingularNestedEnum
+	}
+	return TestAllTypes_FOO
+}
+
+func (x *TestAllTypes) GetSingularForeignEnum() ForeignEnum {
+	if x != nil {
+		return x.SingularForeignEnum
+	}
+	return ForeignEnum_FOREIGN_ZERO
+}
+
+func (x *TestAllTypes) GetSingularImportEnum() ImportEnum {
+	if x != nil {
+		return x.SingularImportEnum
+	}
+	return ImportEnum_IMPORT_ZERO
+}
+
+func (x *TestAllTypes) GetOptionalInt32() int32 {
+	if x != nil && x.OptionalInt32 != nil {
+		return *x.OptionalInt32
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalInt64() int64 {
-	if x != nil {
-		return x.OptionalInt64
+	if x != nil && x.OptionalInt64 != nil {
+		return *x.OptionalInt64
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalUint32() uint32 {
-	if x != nil {
-		return x.OptionalUint32
+	if x != nil && x.OptionalUint32 != nil {
+		return *x.OptionalUint32
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalUint64() uint64 {
-	if x != nil {
-		return x.OptionalUint64
+	if x != nil && x.OptionalUint64 != nil {
+		return *x.OptionalUint64
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalSint32() int32 {
-	if x != nil {
-		return x.OptionalSint32
+	if x != nil && x.OptionalSint32 != nil {
+		return *x.OptionalSint32
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalSint64() int64 {
-	if x != nil {
-		return x.OptionalSint64
+	if x != nil && x.OptionalSint64 != nil {
+		return *x.OptionalSint64
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalFixed32() uint32 {
-	if x != nil {
-		return x.OptionalFixed32
+	if x != nil && x.OptionalFixed32 != nil {
+		return *x.OptionalFixed32
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalFixed64() uint64 {
-	if x != nil {
-		return x.OptionalFixed64
+	if x != nil && x.OptionalFixed64 != nil {
+		return *x.OptionalFixed64
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalSfixed32() int32 {
-	if x != nil {
-		return x.OptionalSfixed32
+	if x != nil && x.OptionalSfixed32 != nil {
+		return *x.OptionalSfixed32
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalSfixed64() int64 {
-	if x != nil {
-		return x.OptionalSfixed64
+	if x != nil && x.OptionalSfixed64 != nil {
+		return *x.OptionalSfixed64
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalFloat() float32 {
-	if x != nil {
-		return x.OptionalFloat
+	if x != nil && x.OptionalFloat != nil {
+		return *x.OptionalFloat
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalDouble() float64 {
-	if x != nil {
-		return x.OptionalDouble
+	if x != nil && x.OptionalDouble != nil {
+		return *x.OptionalDouble
 	}
 	return 0
 }
 
 func (x *TestAllTypes) GetOptionalBool() bool {
-	if x != nil {
-		return x.OptionalBool
+	if x != nil && x.OptionalBool != nil {
+		return *x.OptionalBool
 	}
 	return false
 }
 
 func (x *TestAllTypes) GetOptionalString() string {
-	if x != nil {
-		return x.OptionalString
+	if x != nil && x.OptionalString != nil {
+		return *x.OptionalString
 	}
 	return ""
 }
@@ -354,22 +522,22 @@
 }
 
 func (x *TestAllTypes) GetOptionalNestedEnum() TestAllTypes_NestedEnum {
-	if x != nil {
-		return x.OptionalNestedEnum
+	if x != nil && x.OptionalNestedEnum != nil {
+		return *x.OptionalNestedEnum
 	}
 	return TestAllTypes_FOO
 }
 
 func (x *TestAllTypes) GetOptionalForeignEnum() ForeignEnum {
-	if x != nil {
-		return x.OptionalForeignEnum
+	if x != nil && x.OptionalForeignEnum != nil {
+		return *x.OptionalForeignEnum
 	}
 	return ForeignEnum_FOREIGN_ZERO
 }
 
 func (x *TestAllTypes) GetOptionalImportEnum() ImportEnum {
-	if x != nil {
-		return x.OptionalImportEnum
+	if x != nil && x.OptionalImportEnum != nil {
+		return *x.OptionalImportEnum
 	}
 	return ImportEnum_IMPORT_ZERO
 }
@@ -887,392 +1055,500 @@
 	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x33, 0x1a, 0x2b, 0x69, 0x6e, 0x74,
 	0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73,
 	0x2f, 0x74, 0x65, 0x73, 0x74, 0x33, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x5f, 0x69, 0x6d, 0x70, 0x6f,
-	0x72, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xc6, 0x2e, 0x0a, 0x0c, 0x54, 0x65, 0x73,
-	0x74, 0x41, 0x6c, 0x6c, 0x54, 0x79, 0x70, 0x65, 0x73, 0x12, 0x25, 0x0a, 0x0e, 0x6f, 0x70, 0x74,
-	0x69, 0x6f, 0x6e, 0x61, 0x6c, 0x5f, 0x69, 0x6e, 0x74, 0x33, 0x32, 0x18, 0x01, 0x20, 0x01, 0x28,
-	0x05, 0x52, 0x0d, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x61, 0x6c, 0x49, 0x6e, 0x74, 0x33, 0x32,
-	0x12, 0x25, 0x0a, 0x0e, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x61, 0x6c, 0x5f, 0x69, 0x6e, 0x74,
-	0x36, 0x34, 0x18, 0x02, 0x20, 0x01, 0x28, 0x03, 0x52, 0x0d, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e,
-	0x61, 0x6c, 0x49, 0x6e, 0x74, 0x36, 0x34, 0x12, 0x27, 0x0a, 0x0f, 0x6f, 0x70, 0x74, 0x69, 0x6f,
-	0x6e, 0x61, 0x6c, 0x5f, 0x75, 0x69, 0x6e, 0x74, 0x33, 0x32, 0x18, 0x03, 0x20, 0x01, 0x28, 0x0d,
-	0x52, 0x0e, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x61, 0x6c, 0x55, 0x69, 0x6e, 0x74, 0x33, 0x32,
-	0x12, 0x27, 0x0a, 0x0f, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x61, 0x6c, 0x5f, 0x75, 0x69, 0x6e,
-	0x74, 0x36, 0x34, 0x18, 0x04, 0x20, 0x01, 0x28, 0x04, 0x52, 0x0e, 0x6f, 0x70, 0x74, 0x69, 0x6f,
-	0x6e, 0x61, 0x6c, 0x55, 0x69, 0x6e, 0x74, 0x36, 0x34, 0x12, 0x27, 0x0a, 0x0f, 0x6f, 0x70, 0x74,
-	0x69, 0x6f, 0x6e, 0x61, 0x6c, 0x5f, 0x73, 0x69, 0x6e, 0x74, 0x33, 0x32, 0x18, 0x05, 0x20, 0x01,
-	0x28, 0x11, 0x52, 0x0e, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x61, 0x6c, 0x53, 0x69, 0x6e, 0x74,
-	0x33, 0x32, 0x12, 0x27, 0x0a, 0x0f, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x61, 0x6c, 0x5f, 0x73,
-	0x69, 0x6e, 0x74, 0x36, 0x34, 0x18, 0x06, 0x20, 0x01, 0x28, 0x12, 0x52, 0x0e, 0x6f, 0x70, 0x74,
-	0x69, 0x6f, 0x6e, 0x61, 0x6c, 0x53, 0x69, 0x6e, 0x74, 0x36, 0x34, 0x12, 0x29, 0x0a, 0x10, 0x6f,
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 }
 
 var (
@@ -1316,45 +1592,51 @@
 	(ImportEnum)(0),                    // 23: goproto.proto.test3.ImportEnum
 }
 var file_internal_testprotos_test3_test_proto_depIdxs = []int32{
-	4,  // 0: goproto.proto.test3.TestAllTypes.optional_nested_message:type_name -> goproto.proto.test3.TestAllTypes.NestedMessage
-	3,  // 1: goproto.proto.test3.TestAllTypes.optional_foreign_message:type_name -> goproto.proto.test3.ForeignMessage
-	22, // 2: goproto.proto.test3.TestAllTypes.optional_import_message:type_name -> goproto.proto.test3.ImportMessage
-	1,  // 3: goproto.proto.test3.TestAllTypes.optional_nested_enum:type_name -> goproto.proto.test3.TestAllTypes.NestedEnum
-	0,  // 4: goproto.proto.test3.TestAllTypes.optional_foreign_enum:type_name -> goproto.proto.test3.ForeignEnum
-	23, // 5: goproto.proto.test3.TestAllTypes.optional_import_enum:type_name -> goproto.proto.test3.ImportEnum
-	4,  // 6: goproto.proto.test3.TestAllTypes.repeated_nested_message:type_name -> goproto.proto.test3.TestAllTypes.NestedMessage
-	3,  // 7: goproto.proto.test3.TestAllTypes.repeated_foreign_message:type_name -> goproto.proto.test3.ForeignMessage
-	22, // 8: goproto.proto.test3.TestAllTypes.repeated_importmessage:type_name -> goproto.proto.test3.ImportMessage
-	1,  // 9: goproto.proto.test3.TestAllTypes.repeated_nested_enum:type_name -> goproto.proto.test3.TestAllTypes.NestedEnum
-	0,  // 10: goproto.proto.test3.TestAllTypes.repeated_foreign_enum:type_name -> goproto.proto.test3.ForeignEnum
-	23, // 11: goproto.proto.test3.TestAllTypes.repeated_importenum:type_name -> goproto.proto.test3.ImportEnum
-	5,  // 12: goproto.proto.test3.TestAllTypes.map_int32_int32:type_name -> goproto.proto.test3.TestAllTypes.MapInt32Int32Entry
-	6,  // 13: goproto.proto.test3.TestAllTypes.map_int64_int64:type_name -> goproto.proto.test3.TestAllTypes.MapInt64Int64Entry
-	7,  // 14: goproto.proto.test3.TestAllTypes.map_uint32_uint32:type_name -> goproto.proto.test3.TestAllTypes.MapUint32Uint32Entry
-	8,  // 15: goproto.proto.test3.TestAllTypes.map_uint64_uint64:type_name -> goproto.proto.test3.TestAllTypes.MapUint64Uint64Entry
-	9,  // 16: goproto.proto.test3.TestAllTypes.map_sint32_sint32:type_name -> goproto.proto.test3.TestAllTypes.MapSint32Sint32Entry
-	10, // 17: goproto.proto.test3.TestAllTypes.map_sint64_sint64:type_name -> goproto.proto.test3.TestAllTypes.MapSint64Sint64Entry
-	11, // 18: goproto.proto.test3.TestAllTypes.map_fixed32_fixed32:type_name -> goproto.proto.test3.TestAllTypes.MapFixed32Fixed32Entry
-	12, // 19: goproto.proto.test3.TestAllTypes.map_fixed64_fixed64:type_name -> goproto.proto.test3.TestAllTypes.MapFixed64Fixed64Entry
-	13, // 20: goproto.proto.test3.TestAllTypes.map_sfixed32_sfixed32:type_name -> goproto.proto.test3.TestAllTypes.MapSfixed32Sfixed32Entry
-	14, // 21: goproto.proto.test3.TestAllTypes.map_sfixed64_sfixed64:type_name -> goproto.proto.test3.TestAllTypes.MapSfixed64Sfixed64Entry
-	15, // 22: goproto.proto.test3.TestAllTypes.map_int32_float:type_name -> goproto.proto.test3.TestAllTypes.MapInt32FloatEntry
-	16, // 23: goproto.proto.test3.TestAllTypes.map_int32_double:type_name -> goproto.proto.test3.TestAllTypes.MapInt32DoubleEntry
-	17, // 24: goproto.proto.test3.TestAllTypes.map_bool_bool:type_name -> goproto.proto.test3.TestAllTypes.MapBoolBoolEntry
-	18, // 25: goproto.proto.test3.TestAllTypes.map_string_string:type_name -> goproto.proto.test3.TestAllTypes.MapStringStringEntry
-	19, // 26: goproto.proto.test3.TestAllTypes.map_string_bytes:type_name -> goproto.proto.test3.TestAllTypes.MapStringBytesEntry
-	20, // 27: goproto.proto.test3.TestAllTypes.map_string_nested_message:type_name -> goproto.proto.test3.TestAllTypes.MapStringNestedMessageEntry
-	21, // 28: goproto.proto.test3.TestAllTypes.map_string_nested_enum:type_name -> goproto.proto.test3.TestAllTypes.MapStringNestedEnumEntry
-	4,  // 29: goproto.proto.test3.TestAllTypes.oneof_nested_message:type_name -> goproto.proto.test3.TestAllTypes.NestedMessage
-	1,  // 30: goproto.proto.test3.TestAllTypes.oneof_enum:type_name -> goproto.proto.test3.TestAllTypes.NestedEnum
-	2,  // 31: goproto.proto.test3.TestAllTypes.NestedMessage.corecursive:type_name -> goproto.proto.test3.TestAllTypes
-	4,  // 32: goproto.proto.test3.TestAllTypes.MapStringNestedMessageEntry.value:type_name -> goproto.proto.test3.TestAllTypes.NestedMessage
-	1,  // 33: goproto.proto.test3.TestAllTypes.MapStringNestedEnumEntry.value:type_name -> goproto.proto.test3.TestAllTypes.NestedEnum
-	34, // [34:34] is the sub-list for method output_type
-	34, // [34:34] is the sub-list for method input_type
-	34, // [34:34] is the sub-list for extension type_name
-	34, // [34:34] is the sub-list for extension extendee
-	0,  // [0:34] is the sub-list for field type_name
+	4,  // 0: goproto.proto.test3.TestAllTypes.singular_nested_message:type_name -> goproto.proto.test3.TestAllTypes.NestedMessage
+	3,  // 1: goproto.proto.test3.TestAllTypes.singular_foreign_message:type_name -> goproto.proto.test3.ForeignMessage
+	22, // 2: goproto.proto.test3.TestAllTypes.singular_import_message:type_name -> goproto.proto.test3.ImportMessage
+	1,  // 3: goproto.proto.test3.TestAllTypes.singular_nested_enum:type_name -> goproto.proto.test3.TestAllTypes.NestedEnum
+	0,  // 4: goproto.proto.test3.TestAllTypes.singular_foreign_enum:type_name -> goproto.proto.test3.ForeignEnum
+	23, // 5: goproto.proto.test3.TestAllTypes.singular_import_enum:type_name -> goproto.proto.test3.ImportEnum
+	4,  // 6: goproto.proto.test3.TestAllTypes.optional_nested_message:type_name -> goproto.proto.test3.TestAllTypes.NestedMessage
+	3,  // 7: goproto.proto.test3.TestAllTypes.optional_foreign_message:type_name -> goproto.proto.test3.ForeignMessage
+	22, // 8: goproto.proto.test3.TestAllTypes.optional_import_message:type_name -> goproto.proto.test3.ImportMessage
+	1,  // 9: goproto.proto.test3.TestAllTypes.optional_nested_enum:type_name -> goproto.proto.test3.TestAllTypes.NestedEnum
+	0,  // 10: goproto.proto.test3.TestAllTypes.optional_foreign_enum:type_name -> goproto.proto.test3.ForeignEnum
+	23, // 11: goproto.proto.test3.TestAllTypes.optional_import_enum:type_name -> goproto.proto.test3.ImportEnum
+	4,  // 12: goproto.proto.test3.TestAllTypes.repeated_nested_message:type_name -> goproto.proto.test3.TestAllTypes.NestedMessage
+	3,  // 13: goproto.proto.test3.TestAllTypes.repeated_foreign_message:type_name -> goproto.proto.test3.ForeignMessage
+	22, // 14: goproto.proto.test3.TestAllTypes.repeated_importmessage:type_name -> goproto.proto.test3.ImportMessage
+	1,  // 15: goproto.proto.test3.TestAllTypes.repeated_nested_enum:type_name -> goproto.proto.test3.TestAllTypes.NestedEnum
+	0,  // 16: goproto.proto.test3.TestAllTypes.repeated_foreign_enum:type_name -> goproto.proto.test3.ForeignEnum
+	23, // 17: goproto.proto.test3.TestAllTypes.repeated_importenum:type_name -> goproto.proto.test3.ImportEnum
+	5,  // 18: goproto.proto.test3.TestAllTypes.map_int32_int32:type_name -> goproto.proto.test3.TestAllTypes.MapInt32Int32Entry
+	6,  // 19: goproto.proto.test3.TestAllTypes.map_int64_int64:type_name -> goproto.proto.test3.TestAllTypes.MapInt64Int64Entry
+	7,  // 20: goproto.proto.test3.TestAllTypes.map_uint32_uint32:type_name -> goproto.proto.test3.TestAllTypes.MapUint32Uint32Entry
+	8,  // 21: goproto.proto.test3.TestAllTypes.map_uint64_uint64:type_name -> goproto.proto.test3.TestAllTypes.MapUint64Uint64Entry
+	9,  // 22: goproto.proto.test3.TestAllTypes.map_sint32_sint32:type_name -> goproto.proto.test3.TestAllTypes.MapSint32Sint32Entry
+	10, // 23: goproto.proto.test3.TestAllTypes.map_sint64_sint64:type_name -> goproto.proto.test3.TestAllTypes.MapSint64Sint64Entry
+	11, // 24: goproto.proto.test3.TestAllTypes.map_fixed32_fixed32:type_name -> goproto.proto.test3.TestAllTypes.MapFixed32Fixed32Entry
+	12, // 25: goproto.proto.test3.TestAllTypes.map_fixed64_fixed64:type_name -> goproto.proto.test3.TestAllTypes.MapFixed64Fixed64Entry
+	13, // 26: goproto.proto.test3.TestAllTypes.map_sfixed32_sfixed32:type_name -> goproto.proto.test3.TestAllTypes.MapSfixed32Sfixed32Entry
+	14, // 27: goproto.proto.test3.TestAllTypes.map_sfixed64_sfixed64:type_name -> goproto.proto.test3.TestAllTypes.MapSfixed64Sfixed64Entry
+	15, // 28: goproto.proto.test3.TestAllTypes.map_int32_float:type_name -> goproto.proto.test3.TestAllTypes.MapInt32FloatEntry
+	16, // 29: goproto.proto.test3.TestAllTypes.map_int32_double:type_name -> goproto.proto.test3.TestAllTypes.MapInt32DoubleEntry
+	17, // 30: goproto.proto.test3.TestAllTypes.map_bool_bool:type_name -> goproto.proto.test3.TestAllTypes.MapBoolBoolEntry
+	18, // 31: goproto.proto.test3.TestAllTypes.map_string_string:type_name -> goproto.proto.test3.TestAllTypes.MapStringStringEntry
+	19, // 32: goproto.proto.test3.TestAllTypes.map_string_bytes:type_name -> goproto.proto.test3.TestAllTypes.MapStringBytesEntry
+	20, // 33: goproto.proto.test3.TestAllTypes.map_string_nested_message:type_name -> goproto.proto.test3.TestAllTypes.MapStringNestedMessageEntry
+	21, // 34: goproto.proto.test3.TestAllTypes.map_string_nested_enum:type_name -> goproto.proto.test3.TestAllTypes.MapStringNestedEnumEntry
+	4,  // 35: goproto.proto.test3.TestAllTypes.oneof_nested_message:type_name -> goproto.proto.test3.TestAllTypes.NestedMessage
+	1,  // 36: goproto.proto.test3.TestAllTypes.oneof_enum:type_name -> goproto.proto.test3.TestAllTypes.NestedEnum
+	2,  // 37: goproto.proto.test3.TestAllTypes.NestedMessage.corecursive:type_name -> goproto.proto.test3.TestAllTypes
+	4,  // 38: goproto.proto.test3.TestAllTypes.MapStringNestedMessageEntry.value:type_name -> goproto.proto.test3.TestAllTypes.NestedMessage
+	1,  // 39: goproto.proto.test3.TestAllTypes.MapStringNestedEnumEntry.value:type_name -> goproto.proto.test3.TestAllTypes.NestedEnum
+	40, // [40:40] is the sub-list for method output_type
+	40, // [40:40] is the sub-list for method input_type
+	40, // [40:40] is the sub-list for extension type_name
+	40, // [40:40] is the sub-list for extension extendee
+	0,  // [0:40] is the sub-list for field type_name
 }
 
 func init() { file_internal_testprotos_test3_test_proto_init() }
diff --git a/internal/testprotos/test3/test.proto b/internal/testprotos/test3/test.proto
index 7b95a57..4d9a63c 100644
--- a/internal/testprotos/test3/test.proto
+++ b/internal/testprotos/test3/test.proto
@@ -23,27 +23,49 @@
     NEG = -1;  // Intentionally negative.
   }
 
-  int32         optional_int32    =  1;
-  int64         optional_int64    =  2;
-  uint32        optional_uint32   =  3;
-  uint64        optional_uint64   =  4;
-  sint32        optional_sint32   =  5;
-  sint64        optional_sint64   =  6;
-  fixed32       optional_fixed32  =  7;
-  fixed64       optional_fixed64  =  8;
-  sfixed32      optional_sfixed32 =  9;
-  sfixed64      optional_sfixed64 = 10;
-  float         optional_float    = 11;
-  double        optional_double   = 12;
-  bool          optional_bool     = 13;
-  string        optional_string   = 14;
-  bytes         optional_bytes    = 15;
-  NestedMessage  optional_nested_message  = 18;
-  ForeignMessage optional_foreign_message = 19;
-  ImportMessage  optional_import_message  = 20;
-  NestedEnum     optional_nested_enum     = 21;
-  ForeignEnum    optional_foreign_enum    = 22;
-  ImportEnum     optional_import_enum     = 23;
+  int32         singular_int32    = 81;
+  int64         singular_int64    = 82;
+  uint32        singular_uint32   = 83;
+  uint64        singular_uint64   = 84;
+  sint32        singular_sint32   = 85;
+  sint64        singular_sint64   = 86;
+  fixed32       singular_fixed32  = 87;
+  fixed64       singular_fixed64  = 88;
+  sfixed32      singular_sfixed32 = 89;
+  sfixed64      singular_sfixed64 = 90;
+  float         singular_float    = 91;
+  double        singular_double   = 92;
+  bool          singular_bool     = 93;
+  string        singular_string   = 94;
+  bytes         singular_bytes    = 95;
+  NestedMessage  singular_nested_message  = 98;
+  ForeignMessage singular_foreign_message = 99;
+  ImportMessage  singular_import_message  = 100;
+  NestedEnum     singular_nested_enum     = 101;
+  ForeignEnum    singular_foreign_enum    = 102;
+  ImportEnum     singular_import_enum     = 103;
+
+  optional int32         optional_int32    =  1;
+  optional int64         optional_int64    =  2;
+  optional uint32        optional_uint32   =  3;
+  optional uint64        optional_uint64   =  4;
+  optional sint32        optional_sint32   =  5;
+  optional sint64        optional_sint64   =  6;
+  optional fixed32       optional_fixed32  =  7;
+  optional fixed64       optional_fixed64  =  8;
+  optional sfixed32      optional_sfixed32 =  9;
+  optional sfixed64      optional_sfixed64 = 10;
+  optional float         optional_float    = 11;
+  optional double        optional_double   = 12;
+  optional bool          optional_bool     = 13;
+  optional string        optional_string   = 14;
+  optional bytes         optional_bytes    = 15;
+  optional NestedMessage  optional_nested_message  = 18;
+  optional ForeignMessage optional_foreign_message = 19;
+  optional ImportMessage  optional_import_message  = 20;
+  optional NestedEnum     optional_nested_enum     = 21;
+  optional ForeignEnum    optional_foreign_enum    = 22;
+  optional ImportEnum     optional_import_enum     = 23;
 
   repeated int32         repeated_int32    = 31;
   repeated int64         repeated_int64    = 32;
diff --git a/internal/testprotos/test3/test_extension.pb.go b/internal/testprotos/test3/test_extension.pb.go
new file mode 100644
index 0000000..3105af8
--- /dev/null
+++ b/internal/testprotos/test3/test_extension.pb.go
@@ -0,0 +1,650 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: internal/testprotos/test3/test_extension.proto
+
+package test3
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	descriptorpb "google.golang.org/protobuf/types/descriptorpb"
+	reflect "reflect"
+)
+
+var file_internal_testprotos_test3_test_extension_proto_extTypes = []protoimpl.ExtensionInfo{
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         1001,
+		Name:          "goproto.proto.test3.optional_int32",
+		Tag:           "varint,1001,opt,name=optional_int32",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int64)(nil),
+		Field:         1002,
+		Name:          "goproto.proto.test3.optional_int64",
+		Tag:           "varint,1002,opt,name=optional_int64",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*uint32)(nil),
+		Field:         1003,
+		Name:          "goproto.proto.test3.optional_uint32",
+		Tag:           "varint,1003,opt,name=optional_uint32",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*uint64)(nil),
+		Field:         1004,
+		Name:          "goproto.proto.test3.optional_uint64",
+		Tag:           "varint,1004,opt,name=optional_uint64",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         1005,
+		Name:          "goproto.proto.test3.optional_sint32",
+		Tag:           "zigzag32,1005,opt,name=optional_sint32",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int64)(nil),
+		Field:         1006,
+		Name:          "goproto.proto.test3.optional_sint64",
+		Tag:           "zigzag64,1006,opt,name=optional_sint64",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*uint32)(nil),
+		Field:         1007,
+		Name:          "goproto.proto.test3.optional_fixed32",
+		Tag:           "fixed32,1007,opt,name=optional_fixed32",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*uint64)(nil),
+		Field:         1008,
+		Name:          "goproto.proto.test3.optional_fixed64",
+		Tag:           "fixed64,1008,opt,name=optional_fixed64",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         1009,
+		Name:          "goproto.proto.test3.optional_sfixed32",
+		Tag:           "fixed32,1009,opt,name=optional_sfixed32",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int64)(nil),
+		Field:         1010,
+		Name:          "goproto.proto.test3.optional_sfixed64",
+		Tag:           "fixed64,1010,opt,name=optional_sfixed64",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*float32)(nil),
+		Field:         1011,
+		Name:          "goproto.proto.test3.optional_float",
+		Tag:           "fixed32,1011,opt,name=optional_float",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*float64)(nil),
+		Field:         1012,
+		Name:          "goproto.proto.test3.optional_double",
+		Tag:           "fixed64,1012,opt,name=optional_double",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*bool)(nil),
+		Field:         1013,
+		Name:          "goproto.proto.test3.optional_bool",
+		Tag:           "varint,1013,opt,name=optional_bool",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*string)(nil),
+		Field:         1014,
+		Name:          "goproto.proto.test3.optional_string",
+		Tag:           "bytes,1014,opt,name=optional_string",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: ([]byte)(nil),
+		Field:         1015,
+		Name:          "goproto.proto.test3.optional_bytes",
+		Tag:           "bytes,1015,opt,name=optional_bytes",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*ForeignMessage)(nil),
+		Field:         1016,
+		Name:          "goproto.proto.test3.optional_foreign_message",
+		Tag:           "bytes,1016,opt,name=optional_foreign_message",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*ForeignEnum)(nil),
+		Field:         1017,
+		Name:          "goproto.proto.test3.optional_foreign_enum",
+		Tag:           "varint,1017,opt,name=optional_foreign_enum,enum=goproto.proto.test3.ForeignEnum",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         2001,
+		Name:          "goproto.proto.test3.optional_optional_int32",
+		Tag:           "varint,2001,opt,name=optional_optional_int32",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int64)(nil),
+		Field:         2002,
+		Name:          "goproto.proto.test3.optional_optional_int64",
+		Tag:           "varint,2002,opt,name=optional_optional_int64",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*uint32)(nil),
+		Field:         2003,
+		Name:          "goproto.proto.test3.optional_optional_uint32",
+		Tag:           "varint,2003,opt,name=optional_optional_uint32",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*uint64)(nil),
+		Field:         2004,
+		Name:          "goproto.proto.test3.optional_optional_uint64",
+		Tag:           "varint,2004,opt,name=optional_optional_uint64",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         2005,
+		Name:          "goproto.proto.test3.optional_optional_sint32",
+		Tag:           "zigzag32,2005,opt,name=optional_optional_sint32",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int64)(nil),
+		Field:         2006,
+		Name:          "goproto.proto.test3.optional_optional_sint64",
+		Tag:           "zigzag64,2006,opt,name=optional_optional_sint64",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*uint32)(nil),
+		Field:         2007,
+		Name:          "goproto.proto.test3.optional_optional_fixed32",
+		Tag:           "fixed32,2007,opt,name=optional_optional_fixed32",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*uint64)(nil),
+		Field:         2008,
+		Name:          "goproto.proto.test3.optional_optional_fixed64",
+		Tag:           "fixed64,2008,opt,name=optional_optional_fixed64",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         2009,
+		Name:          "goproto.proto.test3.optional_optional_sfixed32",
+		Tag:           "fixed32,2009,opt,name=optional_optional_sfixed32",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*int64)(nil),
+		Field:         2010,
+		Name:          "goproto.proto.test3.optional_optional_sfixed64",
+		Tag:           "fixed64,2010,opt,name=optional_optional_sfixed64",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*float32)(nil),
+		Field:         2011,
+		Name:          "goproto.proto.test3.optional_optional_float",
+		Tag:           "fixed32,2011,opt,name=optional_optional_float",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*float64)(nil),
+		Field:         2012,
+		Name:          "goproto.proto.test3.optional_optional_double",
+		Tag:           "fixed64,2012,opt,name=optional_optional_double",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*bool)(nil),
+		Field:         2013,
+		Name:          "goproto.proto.test3.optional_optional_bool",
+		Tag:           "varint,2013,opt,name=optional_optional_bool",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*string)(nil),
+		Field:         2014,
+		Name:          "goproto.proto.test3.optional_optional_string",
+		Tag:           "bytes,2014,opt,name=optional_optional_string",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: ([]byte)(nil),
+		Field:         2015,
+		Name:          "goproto.proto.test3.optional_optional_bytes",
+		Tag:           "bytes,2015,opt,name=optional_optional_bytes",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*ForeignMessage)(nil),
+		Field:         2016,
+		Name:          "goproto.proto.test3.optional_optional_foreign_message",
+		Tag:           "bytes,2016,opt,name=optional_optional_foreign_message",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*ForeignEnum)(nil),
+		Field:         2017,
+		Name:          "goproto.proto.test3.optional_optional_foreign_enum",
+		Tag:           "varint,2017,opt,name=optional_optional_foreign_enum,enum=goproto.proto.test3.ForeignEnum",
+		Filename:      "internal/testprotos/test3/test_extension.proto",
+	},
+}
+
+// Extension fields to descriptorpb.MessageOptions.
+var (
+	// optional int32 optional_int32 = 1001;
+	E_OptionalInt32 = &file_internal_testprotos_test3_test_extension_proto_extTypes[0]
+	// optional int64 optional_int64 = 1002;
+	E_OptionalInt64 = &file_internal_testprotos_test3_test_extension_proto_extTypes[1]
+	// optional uint32 optional_uint32 = 1003;
+	E_OptionalUint32 = &file_internal_testprotos_test3_test_extension_proto_extTypes[2]
+	// optional uint64 optional_uint64 = 1004;
+	E_OptionalUint64 = &file_internal_testprotos_test3_test_extension_proto_extTypes[3]
+	// optional sint32 optional_sint32 = 1005;
+	E_OptionalSint32 = &file_internal_testprotos_test3_test_extension_proto_extTypes[4]
+	// optional sint64 optional_sint64 = 1006;
+	E_OptionalSint64 = &file_internal_testprotos_test3_test_extension_proto_extTypes[5]
+	// optional fixed32 optional_fixed32 = 1007;
+	E_OptionalFixed32 = &file_internal_testprotos_test3_test_extension_proto_extTypes[6]
+	// optional fixed64 optional_fixed64 = 1008;
+	E_OptionalFixed64 = &file_internal_testprotos_test3_test_extension_proto_extTypes[7]
+	// optional sfixed32 optional_sfixed32 = 1009;
+	E_OptionalSfixed32 = &file_internal_testprotos_test3_test_extension_proto_extTypes[8]
+	// optional sfixed64 optional_sfixed64 = 1010;
+	E_OptionalSfixed64 = &file_internal_testprotos_test3_test_extension_proto_extTypes[9]
+	// optional float optional_float = 1011;
+	E_OptionalFloat = &file_internal_testprotos_test3_test_extension_proto_extTypes[10]
+	// optional double optional_double = 1012;
+	E_OptionalDouble = &file_internal_testprotos_test3_test_extension_proto_extTypes[11]
+	// optional bool optional_bool = 1013;
+	E_OptionalBool = &file_internal_testprotos_test3_test_extension_proto_extTypes[12]
+	// optional string optional_string = 1014;
+	E_OptionalString = &file_internal_testprotos_test3_test_extension_proto_extTypes[13]
+	// optional bytes optional_bytes = 1015;
+	E_OptionalBytes = &file_internal_testprotos_test3_test_extension_proto_extTypes[14]
+	// optional goproto.proto.test3.ForeignMessage optional_foreign_message = 1016;
+	E_OptionalForeignMessage = &file_internal_testprotos_test3_test_extension_proto_extTypes[15]
+	// optional goproto.proto.test3.ForeignEnum optional_foreign_enum = 1017;
+	E_OptionalForeignEnum = &file_internal_testprotos_test3_test_extension_proto_extTypes[16]
+	// optional int32 optional_optional_int32 = 2001;
+	E_OptionalOptionalInt32 = &file_internal_testprotos_test3_test_extension_proto_extTypes[17]
+	// optional int64 optional_optional_int64 = 2002;
+	E_OptionalOptionalInt64 = &file_internal_testprotos_test3_test_extension_proto_extTypes[18]
+	// optional uint32 optional_optional_uint32 = 2003;
+	E_OptionalOptionalUint32 = &file_internal_testprotos_test3_test_extension_proto_extTypes[19]
+	// optional uint64 optional_optional_uint64 = 2004;
+	E_OptionalOptionalUint64 = &file_internal_testprotos_test3_test_extension_proto_extTypes[20]
+	// optional sint32 optional_optional_sint32 = 2005;
+	E_OptionalOptionalSint32 = &file_internal_testprotos_test3_test_extension_proto_extTypes[21]
+	// optional sint64 optional_optional_sint64 = 2006;
+	E_OptionalOptionalSint64 = &file_internal_testprotos_test3_test_extension_proto_extTypes[22]
+	// optional fixed32 optional_optional_fixed32 = 2007;
+	E_OptionalOptionalFixed32 = &file_internal_testprotos_test3_test_extension_proto_extTypes[23]
+	// optional fixed64 optional_optional_fixed64 = 2008;
+	E_OptionalOptionalFixed64 = &file_internal_testprotos_test3_test_extension_proto_extTypes[24]
+	// optional sfixed32 optional_optional_sfixed32 = 2009;
+	E_OptionalOptionalSfixed32 = &file_internal_testprotos_test3_test_extension_proto_extTypes[25]
+	// optional sfixed64 optional_optional_sfixed64 = 2010;
+	E_OptionalOptionalSfixed64 = &file_internal_testprotos_test3_test_extension_proto_extTypes[26]
+	// optional float optional_optional_float = 2011;
+	E_OptionalOptionalFloat = &file_internal_testprotos_test3_test_extension_proto_extTypes[27]
+	// optional double optional_optional_double = 2012;
+	E_OptionalOptionalDouble = &file_internal_testprotos_test3_test_extension_proto_extTypes[28]
+	// optional bool optional_optional_bool = 2013;
+	E_OptionalOptionalBool = &file_internal_testprotos_test3_test_extension_proto_extTypes[29]
+	// optional string optional_optional_string = 2014;
+	E_OptionalOptionalString = &file_internal_testprotos_test3_test_extension_proto_extTypes[30]
+	// optional bytes optional_optional_bytes = 2015;
+	E_OptionalOptionalBytes = &file_internal_testprotos_test3_test_extension_proto_extTypes[31]
+	// optional goproto.proto.test3.ForeignMessage optional_optional_foreign_message = 2016;
+	E_OptionalOptionalForeignMessage = &file_internal_testprotos_test3_test_extension_proto_extTypes[32]
+	// optional goproto.proto.test3.ForeignEnum optional_optional_foreign_enum = 2017;
+	E_OptionalOptionalForeignEnum = &file_internal_testprotos_test3_test_extension_proto_extTypes[33]
+)
+
+var File_internal_testprotos_test3_test_extension_proto protoreflect.FileDescriptor
+
+var file_internal_testprotos_test3_test_extension_proto_rawDesc = []byte{
+	0x0a, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x33, 0x2f, 0x74, 0x65, 0x73, 0x74,
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+}
+
+var file_internal_testprotos_test3_test_extension_proto_goTypes = []interface{}{
+	(*descriptorpb.MessageOptions)(nil), // 0: google.protobuf.MessageOptions
+	(*ForeignMessage)(nil),              // 1: goproto.proto.test3.ForeignMessage
+	(ForeignEnum)(0),                    // 2: goproto.proto.test3.ForeignEnum
+}
+var file_internal_testprotos_test3_test_extension_proto_depIdxs = []int32{
+	0,  // 0: goproto.proto.test3.optional_int32:extendee -> google.protobuf.MessageOptions
+	0,  // 1: goproto.proto.test3.optional_int64:extendee -> google.protobuf.MessageOptions
+	0,  // 2: goproto.proto.test3.optional_uint32:extendee -> google.protobuf.MessageOptions
+	0,  // 3: goproto.proto.test3.optional_uint64:extendee -> google.protobuf.MessageOptions
+	0,  // 4: goproto.proto.test3.optional_sint32:extendee -> google.protobuf.MessageOptions
+	0,  // 5: goproto.proto.test3.optional_sint64:extendee -> google.protobuf.MessageOptions
+	0,  // 6: goproto.proto.test3.optional_fixed32:extendee -> google.protobuf.MessageOptions
+	0,  // 7: goproto.proto.test3.optional_fixed64:extendee -> google.protobuf.MessageOptions
+	0,  // 8: goproto.proto.test3.optional_sfixed32:extendee -> google.protobuf.MessageOptions
+	0,  // 9: goproto.proto.test3.optional_sfixed64:extendee -> google.protobuf.MessageOptions
+	0,  // 10: goproto.proto.test3.optional_float:extendee -> google.protobuf.MessageOptions
+	0,  // 11: goproto.proto.test3.optional_double:extendee -> google.protobuf.MessageOptions
+	0,  // 12: goproto.proto.test3.optional_bool:extendee -> google.protobuf.MessageOptions
+	0,  // 13: goproto.proto.test3.optional_string:extendee -> google.protobuf.MessageOptions
+	0,  // 14: goproto.proto.test3.optional_bytes:extendee -> google.protobuf.MessageOptions
+	0,  // 15: goproto.proto.test3.optional_foreign_message:extendee -> google.protobuf.MessageOptions
+	0,  // 16: goproto.proto.test3.optional_foreign_enum:extendee -> google.protobuf.MessageOptions
+	0,  // 17: goproto.proto.test3.optional_optional_int32:extendee -> google.protobuf.MessageOptions
+	0,  // 18: goproto.proto.test3.optional_optional_int64:extendee -> google.protobuf.MessageOptions
+	0,  // 19: goproto.proto.test3.optional_optional_uint32:extendee -> google.protobuf.MessageOptions
+	0,  // 20: goproto.proto.test3.optional_optional_uint64:extendee -> google.protobuf.MessageOptions
+	0,  // 21: goproto.proto.test3.optional_optional_sint32:extendee -> google.protobuf.MessageOptions
+	0,  // 22: goproto.proto.test3.optional_optional_sint64:extendee -> google.protobuf.MessageOptions
+	0,  // 23: goproto.proto.test3.optional_optional_fixed32:extendee -> google.protobuf.MessageOptions
+	0,  // 24: goproto.proto.test3.optional_optional_fixed64:extendee -> google.protobuf.MessageOptions
+	0,  // 25: goproto.proto.test3.optional_optional_sfixed32:extendee -> google.protobuf.MessageOptions
+	0,  // 26: goproto.proto.test3.optional_optional_sfixed64:extendee -> google.protobuf.MessageOptions
+	0,  // 27: goproto.proto.test3.optional_optional_float:extendee -> google.protobuf.MessageOptions
+	0,  // 28: goproto.proto.test3.optional_optional_double:extendee -> google.protobuf.MessageOptions
+	0,  // 29: goproto.proto.test3.optional_optional_bool:extendee -> google.protobuf.MessageOptions
+	0,  // 30: goproto.proto.test3.optional_optional_string:extendee -> google.protobuf.MessageOptions
+	0,  // 31: goproto.proto.test3.optional_optional_bytes:extendee -> google.protobuf.MessageOptions
+	0,  // 32: goproto.proto.test3.optional_optional_foreign_message:extendee -> google.protobuf.MessageOptions
+	0,  // 33: goproto.proto.test3.optional_optional_foreign_enum:extendee -> google.protobuf.MessageOptions
+	1,  // 34: goproto.proto.test3.optional_foreign_message:type_name -> goproto.proto.test3.ForeignMessage
+	2,  // 35: goproto.proto.test3.optional_foreign_enum:type_name -> goproto.proto.test3.ForeignEnum
+	1,  // 36: goproto.proto.test3.optional_optional_foreign_message:type_name -> goproto.proto.test3.ForeignMessage
+	2,  // 37: goproto.proto.test3.optional_optional_foreign_enum:type_name -> goproto.proto.test3.ForeignEnum
+	38, // [38:38] is the sub-list for method output_type
+	38, // [38:38] is the sub-list for method input_type
+	34, // [34:38] is the sub-list for extension type_name
+	0,  // [0:34] is the sub-list for extension extendee
+	0,  // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_internal_testprotos_test3_test_extension_proto_init() }
+func file_internal_testprotos_test3_test_extension_proto_init() {
+	if File_internal_testprotos_test3_test_extension_proto != nil {
+		return
+	}
+	file_internal_testprotos_test3_test_proto_init()
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_internal_testprotos_test3_test_extension_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   0,
+			NumExtensions: 34,
+			NumServices:   0,
+		},
+		GoTypes:           file_internal_testprotos_test3_test_extension_proto_goTypes,
+		DependencyIndexes: file_internal_testprotos_test3_test_extension_proto_depIdxs,
+		ExtensionInfos:    file_internal_testprotos_test3_test_extension_proto_extTypes,
+	}.Build()
+	File_internal_testprotos_test3_test_extension_proto = out.File
+	file_internal_testprotos_test3_test_extension_proto_rawDesc = nil
+	file_internal_testprotos_test3_test_extension_proto_goTypes = nil
+	file_internal_testprotos_test3_test_extension_proto_depIdxs = nil
+}
diff --git a/internal/testprotos/test3/test_extension.proto b/internal/testprotos/test3/test_extension.proto
new file mode 100644
index 0000000..18a8381
--- /dev/null
+++ b/internal/testprotos/test3/test_extension.proto
@@ -0,0 +1,50 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+syntax = "proto3";
+
+package goproto.proto.test3;
+
+import "google/protobuf/descriptor.proto";
+import "internal/testprotos/test3/test.proto";
+
+option go_package = "google.golang.org/protobuf/internal/testprotos/test3";
+
+extend google.protobuf.MessageOptions {
+  int32         optional_int32    = 1001;
+  int64         optional_int64    = 1002;
+  uint32        optional_uint32   = 1003;
+  uint64        optional_uint64   = 1004;
+  sint32        optional_sint32   = 1005;
+  sint64        optional_sint64   = 1006;
+  fixed32       optional_fixed32  = 1007;
+  fixed64       optional_fixed64  = 1008;
+  sfixed32      optional_sfixed32 = 1009;
+  sfixed64      optional_sfixed64 = 1010;
+  float         optional_float    = 1011;
+  double        optional_double   = 1012;
+  bool          optional_bool     = 1013;
+  string        optional_string   = 1014;
+  bytes         optional_bytes    = 1015;
+  ForeignMessage optional_foreign_message = 1016;
+  ForeignEnum    optional_foreign_enum    = 1017;
+
+  optional int32         optional_optional_int32    = 2001;
+  optional int64         optional_optional_int64    = 2002;
+  optional uint32        optional_optional_uint32   = 2003;
+  optional uint64        optional_optional_uint64   = 2004;
+  optional sint32        optional_optional_sint32   = 2005;
+  optional sint64        optional_optional_sint64   = 2006;
+  optional fixed32       optional_optional_fixed32  = 2007;
+  optional fixed64       optional_optional_fixed64  = 2008;
+  optional sfixed32      optional_optional_sfixed32 = 2009;
+  optional sfixed64      optional_optional_sfixed64 = 2010;
+  optional float         optional_optional_float    = 2011;
+  optional double        optional_optional_double   = 2012;
+  optional bool          optional_optional_bool     = 2013;
+  optional string        optional_optional_string   = 2014;
+  optional bytes         optional_optional_bytes    = 2015;
+  optional ForeignMessage optional_optional_foreign_message = 2016;
+  optional ForeignEnum    optional_optional_foreign_enum    = 2017;
+}
diff --git a/internal/testprotos/textpb3/test.pb.go b/internal/testprotos/textpb3/test.pb.go
index da625a5..164f8cc 100644
--- a/internal/testprotos/textpb3/test.pb.go
+++ b/internal/testprotos/textpb3/test.pb.go
@@ -117,7 +117,7 @@
 
 // Deprecated: Use Enums_NestedEnum.Descriptor instead.
 func (Enums_NestedEnum) EnumDescriptor() ([]byte, []int) {
-	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{1, 0}
+	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{2, 0}
 }
 
 // Scalars contains scalar field types.
@@ -280,6 +280,133 @@
 	return ""
 }
 
+type Proto3Optional struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	OptBool    *bool    `protobuf:"varint,1,opt,name=opt_bool,json=optBool,proto3,oneof" json:"opt_bool,omitempty"`
+	OptInt32   *int32   `protobuf:"varint,2,opt,name=opt_int32,json=optInt32,proto3,oneof" json:"opt_int32,omitempty"`
+	OptInt64   *int64   `protobuf:"varint,3,opt,name=opt_int64,json=optInt64,proto3,oneof" json:"opt_int64,omitempty"`
+	OptUint32  *uint32  `protobuf:"varint,4,opt,name=opt_uint32,json=optUint32,proto3,oneof" json:"opt_uint32,omitempty"`
+	OptUint64  *uint64  `protobuf:"varint,5,opt,name=opt_uint64,json=optUint64,proto3,oneof" json:"opt_uint64,omitempty"`
+	OptFloat   *float32 `protobuf:"fixed32,6,opt,name=opt_float,json=optFloat,proto3,oneof" json:"opt_float,omitempty"`
+	OptDouble  *float64 `protobuf:"fixed64,7,opt,name=opt_double,json=optDouble,proto3,oneof" json:"opt_double,omitempty"`
+	OptString  *string  `protobuf:"bytes,8,opt,name=opt_string,json=optString,proto3,oneof" json:"opt_string,omitempty"`
+	OptBytes   []byte   `protobuf:"bytes,9,opt,name=opt_bytes,json=optBytes,proto3,oneof" json:"opt_bytes,omitempty"`
+	OptEnum    *Enum    `protobuf:"varint,10,opt,name=opt_enum,json=optEnum,proto3,enum=pb3.Enum,oneof" json:"opt_enum,omitempty"`
+	OptMessage *Nested  `protobuf:"bytes,11,opt,name=opt_message,json=optMessage,proto3,oneof" json:"opt_message,omitempty"`
+}
+
+func (x *Proto3Optional) Reset() {
+	*x = Proto3Optional{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Proto3Optional) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Proto3Optional) ProtoMessage() {}
+
+func (x *Proto3Optional) ProtoReflect() protoreflect.Message {
+	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Proto3Optional.ProtoReflect.Descriptor instead.
+func (*Proto3Optional) Descriptor() ([]byte, []int) {
+	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *Proto3Optional) GetOptBool() bool {
+	if x != nil && x.OptBool != nil {
+		return *x.OptBool
+	}
+	return false
+}
+
+func (x *Proto3Optional) GetOptInt32() int32 {
+	if x != nil && x.OptInt32 != nil {
+		return *x.OptInt32
+	}
+	return 0
+}
+
+func (x *Proto3Optional) GetOptInt64() int64 {
+	if x != nil && x.OptInt64 != nil {
+		return *x.OptInt64
+	}
+	return 0
+}
+
+func (x *Proto3Optional) GetOptUint32() uint32 {
+	if x != nil && x.OptUint32 != nil {
+		return *x.OptUint32
+	}
+	return 0
+}
+
+func (x *Proto3Optional) GetOptUint64() uint64 {
+	if x != nil && x.OptUint64 != nil {
+		return *x.OptUint64
+	}
+	return 0
+}
+
+func (x *Proto3Optional) GetOptFloat() float32 {
+	if x != nil && x.OptFloat != nil {
+		return *x.OptFloat
+	}
+	return 0
+}
+
+func (x *Proto3Optional) GetOptDouble() float64 {
+	if x != nil && x.OptDouble != nil {
+		return *x.OptDouble
+	}
+	return 0
+}
+
+func (x *Proto3Optional) GetOptString() string {
+	if x != nil && x.OptString != nil {
+		return *x.OptString
+	}
+	return ""
+}
+
+func (x *Proto3Optional) GetOptBytes() []byte {
+	if x != nil {
+		return x.OptBytes
+	}
+	return nil
+}
+
+func (x *Proto3Optional) GetOptEnum() Enum {
+	if x != nil && x.OptEnum != nil {
+		return *x.OptEnum
+	}
+	return Enum_ZERO
+}
+
+func (x *Proto3Optional) GetOptMessage() *Nested {
+	if x != nil {
+		return x.OptMessage
+	}
+	return nil
+}
+
 // Message contains enum fields.
 type Enums struct {
 	state         protoimpl.MessageState
@@ -293,7 +420,7 @@
 func (x *Enums) Reset() {
 	*x = Enums{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[1]
+		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[2]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -306,7 +433,7 @@
 func (*Enums) ProtoMessage() {}
 
 func (x *Enums) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[1]
+	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[2]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -319,7 +446,7 @@
 
 // Deprecated: Use Enums.ProtoReflect.Descriptor instead.
 func (*Enums) Descriptor() ([]byte, []int) {
-	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{1}
+	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{2}
 }
 
 func (x *Enums) GetSEnum() Enum {
@@ -348,7 +475,7 @@
 func (x *Nests) Reset() {
 	*x = Nests{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[2]
+		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -361,7 +488,7 @@
 func (*Nests) ProtoMessage() {}
 
 func (x *Nests) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[2]
+	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -374,7 +501,7 @@
 
 // Deprecated: Use Nests.ProtoReflect.Descriptor instead.
 func (*Nests) Descriptor() ([]byte, []int) {
-	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{2}
+	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{3}
 }
 
 func (x *Nests) GetSNested() *Nested {
@@ -397,7 +524,7 @@
 func (x *Nested) Reset() {
 	*x = Nested{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[3]
+		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -410,7 +537,7 @@
 func (*Nested) ProtoMessage() {}
 
 func (x *Nested) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[3]
+	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -423,7 +550,7 @@
 
 // Deprecated: Use Nested.ProtoReflect.Descriptor instead.
 func (*Nested) Descriptor() ([]byte, []int) {
-	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{3}
+	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{4}
 }
 
 func (x *Nested) GetSString() string {
@@ -456,7 +583,7 @@
 func (x *Oneofs) Reset() {
 	*x = Oneofs{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[4]
+		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[5]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -469,7 +596,7 @@
 func (*Oneofs) ProtoMessage() {}
 
 func (x *Oneofs) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[4]
+	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[5]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -482,7 +609,7 @@
 
 // Deprecated: Use Oneofs.ProtoReflect.Descriptor instead.
 func (*Oneofs) Descriptor() ([]byte, []int) {
-	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{4}
+	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{5}
 }
 
 func (m *Oneofs) GetUnion() isOneofs_Union {
@@ -551,7 +678,7 @@
 func (x *Maps) Reset() {
 	*x = Maps{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[5]
+		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -564,7 +691,7 @@
 func (*Maps) ProtoMessage() {}
 
 func (x *Maps) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[5]
+	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -577,7 +704,7 @@
 
 // Deprecated: Use Maps.ProtoReflect.Descriptor instead.
 func (*Maps) Descriptor() ([]byte, []int) {
-	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{5}
+	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{6}
 }
 
 func (x *Maps) GetInt32ToStr() map[int32]string {
@@ -627,7 +754,7 @@
 func (x *JSONNames) Reset() {
 	*x = JSONNames{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[6]
+		mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -640,7 +767,7 @@
 func (*JSONNames) ProtoMessage() {}
 
 func (x *JSONNames) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[6]
+	mi := &file_internal_testprotos_textpb3_test_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -653,7 +780,7 @@
 
 // Deprecated: Use JSONNames.ProtoReflect.Descriptor instead.
 func (*JSONNames) Descriptor() ([]byte, []int) {
-	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{6}
+	return file_internal_testprotos_textpb3_test_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *JSONNames) GetSString() string {
@@ -694,87 +821,123 @@
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 	0x62, 0x79, 0x74, 0x65, 0x73, 0x18, 0x0e, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x06, 0x73, 0x42, 0x79,
 	0x74, 0x65, 0x73, 0x12, 0x19, 0x0a, 0x08, 0x73, 0x5f, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x18,
-	0x0d, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x73, 0x53, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x22, 0x98,
-	0x01, 0x0a, 0x05, 0x45, 0x6e, 0x75, 0x6d, 0x73, 0x12, 0x20, 0x0a, 0x06, 0x73, 0x5f, 0x65, 0x6e,
-	0x75, 0x6d, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x09, 0x2e, 0x70, 0x62, 0x33, 0x2e, 0x45,
-	0x6e, 0x75, 0x6d, 0x52, 0x05, 0x73, 0x45, 0x6e, 0x75, 0x6d, 0x12, 0x39, 0x0a, 0x0d, 0x73, 0x5f,
-	0x6e, 0x65, 0x73, 0x74, 0x65, 0x64, 0x5f, 0x65, 0x6e, 0x75, 0x6d, 0x18, 0x03, 0x20, 0x01, 0x28,
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+	0x65, 0x78, 0x74, 0x70, 0x62, 0x33, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -790,43 +953,46 @@
 }
 
 var file_internal_testprotos_textpb3_test_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_internal_testprotos_textpb3_test_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
+var file_internal_testprotos_textpb3_test_proto_msgTypes = make([]protoimpl.MessageInfo, 13)
 var file_internal_testprotos_textpb3_test_proto_goTypes = []interface{}{
-	(Enum)(0),             // 0: pb3.Enum
-	(Enums_NestedEnum)(0), // 1: pb3.Enums.NestedEnum
-	(*Scalars)(nil),       // 2: pb3.Scalars
-	(*Enums)(nil),         // 3: pb3.Enums
-	(*Nests)(nil),         // 4: pb3.Nests
-	(*Nested)(nil),        // 5: pb3.Nested
-	(*Oneofs)(nil),        // 6: pb3.Oneofs
-	(*Maps)(nil),          // 7: pb3.Maps
-	(*JSONNames)(nil),     // 8: pb3.JSONNames
-	nil,                   // 9: pb3.Maps.Int32ToStrEntry
-	nil,                   // 10: pb3.Maps.BoolToUint32Entry
-	nil,                   // 11: pb3.Maps.Uint64ToEnumEntry
-	nil,                   // 12: pb3.Maps.StrToNestedEntry
-	nil,                   // 13: pb3.Maps.StrToOneofsEntry
+	(Enum)(0),              // 0: pb3.Enum
+	(Enums_NestedEnum)(0),  // 1: pb3.Enums.NestedEnum
+	(*Scalars)(nil),        // 2: pb3.Scalars
+	(*Proto3Optional)(nil), // 3: pb3.Proto3Optional
+	(*Enums)(nil),          // 4: pb3.Enums
+	(*Nests)(nil),          // 5: pb3.Nests
+	(*Nested)(nil),         // 6: pb3.Nested
+	(*Oneofs)(nil),         // 7: pb3.Oneofs
+	(*Maps)(nil),           // 8: pb3.Maps
+	(*JSONNames)(nil),      // 9: pb3.JSONNames
+	nil,                    // 10: pb3.Maps.Int32ToStrEntry
+	nil,                    // 11: pb3.Maps.BoolToUint32Entry
+	nil,                    // 12: pb3.Maps.Uint64ToEnumEntry
+	nil,                    // 13: pb3.Maps.StrToNestedEntry
+	nil,                    // 14: pb3.Maps.StrToOneofsEntry
 }
 var file_internal_testprotos_textpb3_test_proto_depIdxs = []int32{
-	0,  // 0: pb3.Enums.s_enum:type_name -> pb3.Enum
-	1,  // 1: pb3.Enums.s_nested_enum:type_name -> pb3.Enums.NestedEnum
-	5,  // 2: pb3.Nests.s_nested:type_name -> pb3.Nested
-	5,  // 3: pb3.Nested.s_nested:type_name -> pb3.Nested
-	0,  // 4: pb3.Oneofs.oneof_enum:type_name -> pb3.Enum
-	5,  // 5: pb3.Oneofs.oneof_nested:type_name -> pb3.Nested
-	9,  // 6: pb3.Maps.int32_to_str:type_name -> pb3.Maps.Int32ToStrEntry
-	10, // 7: pb3.Maps.bool_to_uint32:type_name -> pb3.Maps.BoolToUint32Entry
-	11, // 8: pb3.Maps.uint64_to_enum:type_name -> pb3.Maps.Uint64ToEnumEntry
-	12, // 9: pb3.Maps.str_to_nested:type_name -> pb3.Maps.StrToNestedEntry
-	13, // 10: pb3.Maps.str_to_oneofs:type_name -> pb3.Maps.StrToOneofsEntry
-	0,  // 11: pb3.Maps.Uint64ToEnumEntry.value:type_name -> pb3.Enum
-	5,  // 12: pb3.Maps.StrToNestedEntry.value:type_name -> pb3.Nested
-	6,  // 13: pb3.Maps.StrToOneofsEntry.value:type_name -> pb3.Oneofs
-	14, // [14:14] is the sub-list for method output_type
-	14, // [14:14] is the sub-list for method input_type
-	14, // [14:14] is the sub-list for extension type_name
-	14, // [14:14] is the sub-list for extension extendee
-	0,  // [0:14] is the sub-list for field type_name
+	0,  // 0: pb3.Proto3Optional.opt_enum:type_name -> pb3.Enum
+	6,  // 1: pb3.Proto3Optional.opt_message:type_name -> pb3.Nested
+	0,  // 2: pb3.Enums.s_enum:type_name -> pb3.Enum
+	1,  // 3: pb3.Enums.s_nested_enum:type_name -> pb3.Enums.NestedEnum
+	6,  // 4: pb3.Nests.s_nested:type_name -> pb3.Nested
+	6,  // 5: pb3.Nested.s_nested:type_name -> pb3.Nested
+	0,  // 6: pb3.Oneofs.oneof_enum:type_name -> pb3.Enum
+	6,  // 7: pb3.Oneofs.oneof_nested:type_name -> pb3.Nested
+	10, // 8: pb3.Maps.int32_to_str:type_name -> pb3.Maps.Int32ToStrEntry
+	11, // 9: pb3.Maps.bool_to_uint32:type_name -> pb3.Maps.BoolToUint32Entry
+	12, // 10: pb3.Maps.uint64_to_enum:type_name -> pb3.Maps.Uint64ToEnumEntry
+	13, // 11: pb3.Maps.str_to_nested:type_name -> pb3.Maps.StrToNestedEntry
+	14, // 12: pb3.Maps.str_to_oneofs:type_name -> pb3.Maps.StrToOneofsEntry
+	0,  // 13: pb3.Maps.Uint64ToEnumEntry.value:type_name -> pb3.Enum
+	6,  // 14: pb3.Maps.StrToNestedEntry.value:type_name -> pb3.Nested
+	7,  // 15: pb3.Maps.StrToOneofsEntry.value:type_name -> pb3.Oneofs
+	16, // [16:16] is the sub-list for method output_type
+	16, // [16:16] is the sub-list for method input_type
+	16, // [16:16] is the sub-list for extension type_name
+	16, // [16:16] is the sub-list for extension extendee
+	0,  // [0:16] is the sub-list for field type_name
 }
 
 func init() { file_internal_testprotos_textpb3_test_proto_init() }
@@ -848,7 +1014,7 @@
 			}
 		}
 		file_internal_testprotos_textpb3_test_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Enums); i {
+			switch v := v.(*Proto3Optional); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -860,7 +1026,7 @@
 			}
 		}
 		file_internal_testprotos_textpb3_test_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Nests); i {
+			switch v := v.(*Enums); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -872,7 +1038,7 @@
 			}
 		}
 		file_internal_testprotos_textpb3_test_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Nested); i {
+			switch v := v.(*Nests); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -884,7 +1050,7 @@
 			}
 		}
 		file_internal_testprotos_textpb3_test_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Oneofs); i {
+			switch v := v.(*Nested); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -896,7 +1062,7 @@
 			}
 		}
 		file_internal_testprotos_textpb3_test_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Maps); i {
+			switch v := v.(*Oneofs); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -908,6 +1074,18 @@
 			}
 		}
 		file_internal_testprotos_textpb3_test_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Maps); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_internal_testprotos_textpb3_test_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*JSONNames); i {
 			case 0:
 				return &v.state
@@ -920,7 +1098,8 @@
 			}
 		}
 	}
-	file_internal_testprotos_textpb3_test_proto_msgTypes[4].OneofWrappers = []interface{}{
+	file_internal_testprotos_textpb3_test_proto_msgTypes[1].OneofWrappers = []interface{}{}
+	file_internal_testprotos_textpb3_test_proto_msgTypes[5].OneofWrappers = []interface{}{
 		(*Oneofs_OneofEnum)(nil),
 		(*Oneofs_OneofString)(nil),
 		(*Oneofs_OneofNested)(nil),
@@ -931,7 +1110,7 @@
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_internal_testprotos_textpb3_test_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   12,
+			NumMessages:   13,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/internal/testprotos/textpb3/test.proto b/internal/testprotos/textpb3/test.proto
index c2006bd..7a5f440 100644
--- a/internal/testprotos/textpb3/test.proto
+++ b/internal/testprotos/textpb3/test.proto
@@ -33,6 +33,20 @@
   string s_string = 13;
 }
 
+message Proto3Optional {
+  optional bool opt_bool = 1;
+  optional int32 opt_int32 = 2;
+  optional int64 opt_int64 = 3;
+  optional uint32 opt_uint32 = 4;
+  optional uint64 opt_uint64 = 5;
+  optional float opt_float = 6;
+  optional double opt_double = 7;
+  optional string opt_string = 8;
+  optional bytes opt_bytes = 9;
+  optional Enum opt_enum = 10;
+  optional Nested opt_message = 11;
+}
+
 enum Enum {
   ZERO = 0;
   ONE = 1;
diff --git a/proto/decode_test.go b/proto/decode_test.go
index 766c12d..3f64dd4 100644
--- a/proto/decode_test.go
+++ b/proto/decode_test.go
@@ -92,7 +92,7 @@
 	// Verify that proto3 bytes fields don't give the mistaken
 	// impression that they preserve presence.
 	wire := protopack.Message{
-		protopack.Tag{15, protopack.BytesType}, protopack.Bytes(nil),
+		protopack.Tag{94, protopack.BytesType}, protopack.Bytes(nil),
 	}.Marshal()
 	m := &test3pb.TestAllTypes{}
 	if err := proto.Unmarshal(wire, m); err != nil {
diff --git a/proto/encode_test.go b/proto/encode_test.go
index 1cdbabc..852aa57 100644
--- a/proto/encode_test.go
+++ b/proto/encode_test.go
@@ -112,7 +112,7 @@
 	want := []byte("prefix")
 	got := append([]byte(nil), want...)
 	got, err := proto.MarshalOptions{}.MarshalAppend(got, &test3pb.TestAllTypes{
-		OptionalString: "value",
+		SingularString: "value",
 	})
 	if err != nil {
 		t.Fatal(err)
@@ -153,7 +153,7 @@
 }
 
 func TestMarshalAppendAllocations(t *testing.T) {
-	m := &test3pb.TestAllTypes{OptionalInt32: 1}
+	m := &test3pb.TestAllTypes{SingularInt32: 1}
 	size := proto.Size(m)
 	const count = 1000
 	b := make([]byte, size)
diff --git a/proto/equal_test.go b/proto/equal_test.go
index 95ec497..8d85397 100644
--- a/proto/equal_test.go
+++ b/proto/equal_test.go
@@ -166,6 +166,57 @@
 			y: &testpb.TestAllTypes{OptionalNestedEnum: testpb.TestAllTypes_FOO.Enum()},
 		},
 
+		// Proto3 presence.
+		{
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalInt32: proto.Int32(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalInt64: proto.Int64(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalUint32: proto.Uint32(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalUint64: proto.Uint64(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalSint32: proto.Int32(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalSint64: proto.Int64(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalFixed32: proto.Uint32(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalFixed64: proto.Uint64(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalSfixed32: proto.Int32(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalSfixed64: proto.Int64(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalFloat: proto.Float32(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalDouble: proto.Float64(0)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalBool: proto.Bool(false)},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalString: proto.String("")},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalBytes: []byte{}},
+		}, {
+			x: &test3pb.TestAllTypes{},
+			y: &test3pb.TestAllTypes{OptionalNestedEnum: test3pb.TestAllTypes_FOO.Enum()},
+		},
+
 		// Proto2 default values are not considered by Equal, so the following are still unequal.
 		{
 			x: &testpb.TestAllTypes{DefaultInt32: proto.Int32(81)},
diff --git a/proto/extension_test.go b/proto/extension_test.go
index 212a6f7..b3ab788 100644
--- a/proto/extension_test.go
+++ b/proto/extension_test.go
@@ -20,6 +20,8 @@
 
 	legacy1pb "google.golang.org/protobuf/internal/testprotos/legacy/proto2_20160225_2fc053c5"
 	testpb "google.golang.org/protobuf/internal/testprotos/test"
+	test3pb "google.golang.org/protobuf/internal/testprotos/test3"
+	descpb "google.golang.org/protobuf/types/descriptorpb"
 )
 
 func TestExtensionFuncs(t *testing.T) {
@@ -205,29 +207,49 @@
 }
 
 func TestExtensionRanger(t *testing.T) {
-	want := map[pref.ExtensionType]interface{}{
-		testpb.E_OptionalInt32:         int32(5),
-		testpb.E_OptionalString:        string("hello"),
-		testpb.E_OptionalNestedMessage: &testpb.TestAllExtensions_NestedMessage{},
-		testpb.E_OptionalNestedEnum:    testpb.TestAllTypes_BAZ,
-		testpb.E_RepeatedFloat:         []float32{+32.32, -32.32},
-		testpb.E_RepeatedNestedMessage: []*testpb.TestAllExtensions_NestedMessage{{}},
-		testpb.E_RepeatedNestedEnum:    []testpb.TestAllTypes_NestedEnum{testpb.TestAllTypes_BAZ},
-	}
+	tests := []struct {
+		msg  proto.Message
+		want map[pref.ExtensionType]interface{}
+	}{{
+		msg: &testpb.TestAllExtensions{},
+		want: map[pref.ExtensionType]interface{}{
+			testpb.E_OptionalInt32:         int32(5),
+			testpb.E_OptionalString:        string("hello"),
+			testpb.E_OptionalNestedMessage: &testpb.TestAllExtensions_NestedMessage{},
+			testpb.E_OptionalNestedEnum:    testpb.TestAllTypes_BAZ,
+			testpb.E_RepeatedFloat:         []float32{+32.32, -32.32},
+			testpb.E_RepeatedNestedMessage: []*testpb.TestAllExtensions_NestedMessage{{}},
+			testpb.E_RepeatedNestedEnum:    []testpb.TestAllTypes_NestedEnum{testpb.TestAllTypes_BAZ},
+		},
+	}, {
+		msg: &descpb.MessageOptions{},
+		want: map[pref.ExtensionType]interface{}{
+			test3pb.E_OptionalInt32:          int32(5),
+			test3pb.E_OptionalString:         string("hello"),
+			test3pb.E_OptionalForeignMessage: &test3pb.ForeignMessage{},
+			test3pb.E_OptionalForeignEnum:    test3pb.ForeignEnum_FOREIGN_BAR,
 
-	m := &testpb.TestAllExtensions{}
-	for xt, v := range want {
-		proto.SetExtension(m, xt, v)
-	}
+			test3pb.E_OptionalOptionalInt32:          int32(5),
+			test3pb.E_OptionalOptionalString:         string("hello"),
+			test3pb.E_OptionalOptionalForeignMessage: &test3pb.ForeignMessage{},
+			test3pb.E_OptionalOptionalForeignEnum:    test3pb.ForeignEnum_FOREIGN_BAR,
+		},
+	}}
 
-	got := make(map[pref.ExtensionType]interface{})
-	proto.RangeExtensions(m, func(xt pref.ExtensionType, v interface{}) bool {
-		got[xt] = v
-		return true
-	})
+	for _, tt := range tests {
+		for xt, v := range tt.want {
+			proto.SetExtension(tt.msg, xt, v)
+		}
 
-	if diff := cmp.Diff(want, got, protocmp.Transform()); diff != "" {
-		t.Errorf("proto.RangeExtensions mismatch (-want +got):\n%s", diff)
+		got := make(map[pref.ExtensionType]interface{})
+		proto.RangeExtensions(tt.msg, func(xt pref.ExtensionType, v interface{}) bool {
+			got[xt] = v
+			return true
+		})
+
+		if diff := cmp.Diff(tt.want, got, protocmp.Transform()); diff != "" {
+			t.Errorf("proto.RangeExtensions mismatch (-want +got):\n%s", diff)
+		}
 	}
 }
 
diff --git a/proto/merge_test.go b/proto/merge_test.go
index 7cc2093..05978cb 100644
--- a/proto/merge_test.go
+++ b/proto/merge_test.go
@@ -677,10 +677,10 @@
 		},
 	}, {
 		label: "Proto3EmptyBytes",
-		dst:   &test3pb.TestAllTypes{OptionalBytes: nil},
-		src:   &test3pb.TestAllTypes{OptionalBytes: []byte{}},
+		dst:   &test3pb.TestAllTypes{SingularBytes: nil},
+		src:   &test3pb.TestAllTypes{SingularBytes: []byte{}},
 		check: func(m proto.Message) bool {
-			return m.(*test3pb.TestAllTypes).OptionalBytes == nil
+			return m.(*test3pb.TestAllTypes).SingularBytes == nil
 		},
 	}, {
 		label: "EmptyList",
diff --git a/proto/testmessages_test.go b/proto/testmessages_test.go
index b0090fe..441f646 100644
--- a/proto/testmessages_test.go
+++ b/proto/testmessages_test.go
@@ -140,6 +140,43 @@
 		}.Marshal(),
 	},
 	{
+		desc: "proto3 zero values",
+		decodeTo: makeMessages(protobuild.Message{
+			"singular_int32":    0,
+			"singular_int64":    0,
+			"singular_uint32":   0,
+			"singular_uint64":   0,
+			"singular_sint32":   0,
+			"singular_sint64":   0,
+			"singular_fixed32":  0,
+			"singular_fixed64":  0,
+			"singular_sfixed32": 0,
+			"singular_sfixed64": 0,
+			"singular_float":    0,
+			"singular_double":   0,
+			"singular_bool":     false,
+			"singular_string":   "",
+			"singular_bytes":    []byte{},
+		}, &test3pb.TestAllTypes{}),
+		wire: protopack.Message{
+			protopack.Tag{81, protopack.VarintType}, protopack.Varint(0),
+			protopack.Tag{82, protopack.VarintType}, protopack.Varint(0),
+			protopack.Tag{83, protopack.VarintType}, protopack.Uvarint(0),
+			protopack.Tag{84, protopack.VarintType}, protopack.Uvarint(0),
+			protopack.Tag{85, protopack.VarintType}, protopack.Svarint(0),
+			protopack.Tag{86, protopack.VarintType}, protopack.Svarint(0),
+			protopack.Tag{87, protopack.Fixed32Type}, protopack.Uint32(0),
+			protopack.Tag{88, protopack.Fixed64Type}, protopack.Uint64(0),
+			protopack.Tag{89, protopack.Fixed32Type}, protopack.Int32(0),
+			protopack.Tag{90, protopack.Fixed64Type}, protopack.Int64(0),
+			protopack.Tag{91, protopack.Fixed32Type}, protopack.Float32(0),
+			protopack.Tag{92, protopack.Fixed64Type}, protopack.Float64(0),
+			protopack.Tag{93, protopack.VarintType}, protopack.Bool(false),
+			protopack.Tag{94, protopack.BytesType}, protopack.String(""),
+			protopack.Tag{95, protopack.BytesType}, protopack.Bytes(nil),
+		}.Marshal(),
+	},
+	{
 		desc: "groups",
 		decodeTo: makeMessages(protobuild.Message{
 			"optionalgroup": protobuild.Message{
@@ -1522,10 +1559,10 @@
 	{
 		desc: "invalid UTF-8 in optional string field",
 		decodeTo: makeMessages(protobuild.Message{
-			"optional_string": "abc\xff",
+			"singular_string": "abc\xff",
 		}, &test3pb.TestAllTypes{}),
 		wire: protopack.Message{
-			protopack.Tag{14, protopack.BytesType}, protopack.String("abc\xff"),
+			protopack.Tag{94, protopack.BytesType}, protopack.String("abc\xff"),
 		}.Marshal(),
 	},
 	{
@@ -1543,14 +1580,14 @@
 		decodeTo: makeMessages(protobuild.Message{
 			"optional_nested_message": protobuild.Message{
 				"corecursive": protobuild.Message{
-					"optional_string": "abc\xff",
+					"singular_string": "abc\xff",
 				},
 			},
 		}, &test3pb.TestAllTypes{}),
 		wire: protopack.Message{
 			protopack.Tag{18, protopack.BytesType}, protopack.LengthPrefix(protopack.Message{
 				protopack.Tag{2, protopack.BytesType}, protopack.LengthPrefix(protopack.Message{
-					protopack.Tag{14, protopack.BytesType}, protopack.String("abc\xff"),
+					protopack.Tag{94, protopack.BytesType}, protopack.String("abc\xff"),
 				}),
 			}),
 		}.Marshal(),
diff --git a/reflect/protodesc/desc_init.go b/reflect/protodesc/desc_init.go
index ddb6c59..673a230 100644
--- a/reflect/protodesc/desc_init.go
+++ b/reflect/protodesc/desc_init.go
@@ -121,6 +121,7 @@
 		if f.L0, err = r.makeBase(f, parent, fd.GetName(), i, sb); err != nil {
 			return nil, err
 		}
+		f.L1.IsProto3Optional = fd.GetProto3Optional()
 		if opts := fd.GetOptions(); opts != nil {
 			opts = proto.Clone(opts).(*descriptorpb.FieldOptions)
 			f.L1.Options = func() protoreflect.ProtoMessage { return opts }
diff --git a/reflect/protodesc/desc_validate.go b/reflect/protodesc/desc_validate.go
index 2a2bf75..cf9641a 100644
--- a/reflect/protodesc/desc_validate.go
+++ b/reflect/protodesc/desc_validate.go
@@ -147,6 +147,17 @@
 			if fd.Extendee != nil {
 				return errors.New("message field %q may not have extendee: %q", f.FullName(), fd.GetExtendee())
 			}
+			if f.L1.IsProto3Optional {
+				if f.Syntax() != protoreflect.Proto3 {
+					return errors.New("message field %q under proto3 optional semantics must be specified in the proto3 syntax", f.FullName())
+				}
+				if f.Cardinality() != protoreflect.Optional {
+					return errors.New("message field %q under proto3 optional semantics must have optional cardinality", f.FullName())
+				}
+				if f.ContainingOneof() != nil && f.ContainingOneof().Fields().Len() != 1 {
+					return errors.New("message field %q under proto3 optional semantics must be within a single element oneof", f.FullName())
+				}
+			}
 			if f.IsWeak() && !flags.ProtoLegacy {
 				return errors.New("message field %q is a weak field, which is a legacy proto1 feature that is no longer supported", f.FullName())
 			}
@@ -171,6 +182,7 @@
 				}
 			}
 		}
+		seenSynthetic := false // synthetic oneofs for proto3 optional must come after real oneofs
 		for j := range md.GetOneofDecl() {
 			o := &m.L2.Oneofs.List[j]
 			if o.Fields().Len() == 0 {
@@ -179,6 +191,15 @@
 			if n := o.Fields().Len(); n-1 != (o.Fields().Get(n-1).Index() - o.Fields().Get(0).Index()) {
 				return errors.New("message oneof %q must have consecutively declared fields", o.FullName())
 			}
+
+			if o.IsSynthetic() {
+				seenSynthetic = true
+				continue
+			}
+			if !o.IsSynthetic() && seenSynthetic {
+				return errors.New("message oneof %q must be declared before synthetic oneofs", o.FullName())
+			}
+
 			for i := 0; i < o.Fields().Len(); i++ {
 				f := o.Fields().Get(i)
 				if f.Cardinality() != protoreflect.Optional {
diff --git a/reflect/protodesc/proto.go b/reflect/protodesc/proto.go
index 1b0de15..00d35e0 100644
--- a/reflect/protodesc/proto.go
+++ b/reflect/protodesc/proto.go
@@ -140,6 +140,9 @@
 	if field.HasJSONName() {
 		p.JsonName = proto.String(field.JSONName())
 	}
+	if field.Syntax() == protoreflect.Proto3 && field.HasOptionalKeyword() {
+		p.Proto3Optional = proto.Bool(true)
+	}
 	if field.HasDefault() {
 		def, err := defval.Marshal(field.Default(), field.DefaultEnumValue(), field.Kind(), defval.Descriptor)
 		if err != nil && field.DefaultEnumValue() != nil {
diff --git a/reflect/protoreflect/type.go b/reflect/protoreflect/type.go
index 41d560e..a6d9136 100644
--- a/reflect/protoreflect/type.go
+++ b/reflect/protoreflect/type.go
@@ -281,11 +281,19 @@
 	// It is usually the camel-cased form of the field name.
 	JSONName() string
 
+	// HasPresence reports whether the field distinguishes between unpopulated
+	// and default values.
+	HasPresence() bool
+
 	// IsExtension reports whether this is an extension field. If false,
 	// then Parent and ContainingMessage refer to the same message.
 	// Otherwise, ContainingMessage and Parent likely differ.
 	IsExtension() bool
 
+	// HasOptionalKeyword reports whether the "optional" keyword was explicitly
+	// specific in the source .proto file.
+	HasOptionalKeyword() bool
+
 	// IsWeak reports whether this is a weak field, which does not impose a
 	// direct dependency on the target type.
 	// If true, then Message returns a placeholder type.
@@ -375,6 +383,11 @@
 type OneofDescriptor interface {
 	Descriptor
 
+	// IsSynthetic reports whether this is a synthetic oneof created to support
+	// proto3 optional semantics. If true, Fields contains exactly one field
+	// with HasOptionalKeyword specified.
+	IsSynthetic() bool
+
 	// Fields is a list of fields belonging to this oneof.
 	Fields() FieldDescriptors
 
diff --git a/types/descriptorpb/descriptor.pb.go b/types/descriptorpb/descriptor.pb.go
index 7116dcf..8242378 100644
--- a/types/descriptorpb/descriptor.pb.go
+++ b/types/descriptorpb/descriptor.pb.go
@@ -881,6 +881,28 @@
 	// it to camelCase.
 	JsonName *string       `protobuf:"bytes,10,opt,name=json_name,json=jsonName" json:"json_name,omitempty"`
 	Options  *FieldOptions `protobuf:"bytes,8,opt,name=options" json:"options,omitempty"`
+	// If true, this is a proto3 "optional". When a proto3 field is optional, it
+	// tracks presence regardless of field type.
+	//
+	// When proto3_optional is true, this field must be belong to a oneof to
+	// signal to old proto3 clients that presence is tracked for this field. This
+	// oneof is known as a "synthetic" oneof, and this field must be its sole
+	// member (each proto3 optional field gets its own synthetic oneof). Synthetic
+	// oneofs exist in the descriptor only, and do not generate any API. Synthetic
+	// oneofs must be ordered after all "real" oneofs.
+	//
+	// For message fields, proto3_optional doesn't create any semantic change,
+	// since non-repeated message fields always track presence. However it still
+	// indicates the semantic detail of whether the user wrote "optional" or not.
+	// This can be useful for round-tripping the .proto file. For consistency we
+	// give message fields a synthetic oneof also, even though it is not required
+	// to track presence. This is especially important because the parser can't
+	// tell if a field is a message or an enum, so it must always create a
+	// synthetic oneof.
+	//
+	// Proto2 optional fields do not set this flag, because they already indicate
+	// optional with `LABEL_OPTIONAL`.
+	Proto3Optional *bool `protobuf:"varint,17,opt,name=proto3_optional,json=proto3Optional" json:"proto3_optional,omitempty"`
 }
 
 func (x *FieldDescriptorProto) Reset() {
@@ -985,6 +1007,13 @@
 	return nil
 }
 
+func (x *FieldDescriptorProto) GetProto3Optional() bool {
+	if x != nil && x.Proto3Optional != nil {
+		return *x.Proto3Optional
+	}
+	return false
+}
+
 // Describes a oneof.
 type OneofDescriptorProto struct {
 	state         protoimpl.MessageState
@@ -1415,7 +1444,7 @@
 	Deprecated *bool `protobuf:"varint,23,opt,name=deprecated,def=0" json:"deprecated,omitempty"`
 	// Enables the use of arenas for the proto messages in this file. This applies
 	// only to generated classes for C++.
-	CcEnableArenas *bool `protobuf:"varint,31,opt,name=cc_enable_arenas,json=ccEnableArenas,def=0" json:"cc_enable_arenas,omitempty"`
+	CcEnableArenas *bool `protobuf:"varint,31,opt,name=cc_enable_arenas,json=ccEnableArenas,def=1" json:"cc_enable_arenas,omitempty"`
 	// Sets the objective c class prefix which is prepended to all objective c
 	// generated classes from this .proto. There is no default.
 	ObjcClassPrefix *string `protobuf:"bytes,36,opt,name=objc_class_prefix,json=objcClassPrefix" json:"objc_class_prefix,omitempty"`
@@ -1456,7 +1485,7 @@
 	Default_FileOptions_PyGenericServices   = bool(false)
 	Default_FileOptions_PhpGenericServices  = bool(false)
 	Default_FileOptions_Deprecated          = bool(false)
-	Default_FileOptions_CcEnableArenas      = bool(false)
+	Default_FileOptions_CcEnableArenas      = bool(true)
 )
 
 func (x *FileOptions) Reset() {
@@ -3167,7 +3196,7 @@
 	0x55, 0x6e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x70, 0x72, 0x65, 0x74, 0x65, 0x64, 0x4f, 0x70, 0x74,
 	0x69, 0x6f, 0x6e, 0x52, 0x13, 0x75, 0x6e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x70, 0x72, 0x65, 0x74,
 	0x65, 0x64, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x2a, 0x09, 0x08, 0xe8, 0x07, 0x10, 0x80, 0x80,
-	0x80, 0x80, 0x02, 0x22, 0x98, 0x06, 0x0a, 0x14, 0x46, 0x69, 0x65, 0x6c, 0x64, 0x44, 0x65, 0x73,
+	0x80, 0x80, 0x02, 0x22, 0xc1, 0x06, 0x0a, 0x14, 0x46, 0x69, 0x65, 0x6c, 0x64, 0x44, 0x65, 0x73,
 	0x63, 0x72, 0x69, 0x70, 0x74, 0x6f, 0x72, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x12, 0x0a, 0x04,
 	0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65,
 	0x12, 0x16, 0x0a, 0x06, 0x6e, 0x75, 0x6d, 0x62, 0x65, 0x72, 0x18, 0x03, 0x20, 0x01, 0x28, 0x05,
@@ -3193,348 +3222,351 @@
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+	0x50, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x52, 0x65, 0x66, 0x6c, 0x65, 0x63, 0x74,
+	0x69, 0x6f, 0x6e,
 }
 
 var (
diff --git a/types/pluginpb/plugin.pb.go b/types/pluginpb/plugin.pb.go
index 4b74400..43ef7cb 100644
--- a/types/pluginpb/plugin.pb.go
+++ b/types/pluginpb/plugin.pb.go
@@ -57,6 +57,63 @@
 	sync "sync"
 )
 
+// Sync with code_generator.h.
+type CodeGeneratorResponse_Feature int32
+
+const (
+	CodeGeneratorResponse_FEATURE_NONE            CodeGeneratorResponse_Feature = 0
+	CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL CodeGeneratorResponse_Feature = 1
+)
+
+// Enum value maps for CodeGeneratorResponse_Feature.
+var (
+	CodeGeneratorResponse_Feature_name = map[int32]string{
+		0: "FEATURE_NONE",
+		1: "FEATURE_PROTO3_OPTIONAL",
+	}
+	CodeGeneratorResponse_Feature_value = map[string]int32{
+		"FEATURE_NONE":            0,
+		"FEATURE_PROTO3_OPTIONAL": 1,
+	}
+)
+
+func (x CodeGeneratorResponse_Feature) Enum() *CodeGeneratorResponse_Feature {
+	p := new(CodeGeneratorResponse_Feature)
+	*p = x
+	return p
+}
+
+func (x CodeGeneratorResponse_Feature) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (CodeGeneratorResponse_Feature) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_protobuf_compiler_plugin_proto_enumTypes[0].Descriptor()
+}
+
+func (CodeGeneratorResponse_Feature) Type() protoreflect.EnumType {
+	return &file_google_protobuf_compiler_plugin_proto_enumTypes[0]
+}
+
+func (x CodeGeneratorResponse_Feature) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *CodeGeneratorResponse_Feature) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = CodeGeneratorResponse_Feature(num)
+	return nil
+}
+
+// Deprecated: Use CodeGeneratorResponse_Feature.Descriptor instead.
+func (CodeGeneratorResponse_Feature) EnumDescriptor() ([]byte, []int) {
+	return file_google_protobuf_compiler_plugin_proto_rawDescGZIP(), []int{2, 0}
+}
+
 // The version number of protocol compiler.
 type Version struct {
 	state         protoimpl.MessageState
@@ -236,8 +293,11 @@
 	// problem in protoc itself -- such as the input CodeGeneratorRequest being
 	// unparseable -- should be reported by writing a message to stderr and
 	// exiting with a non-zero status code.
-	Error *string                       `protobuf:"bytes,1,opt,name=error" json:"error,omitempty"`
-	File  []*CodeGeneratorResponse_File `protobuf:"bytes,15,rep,name=file" json:"file,omitempty"`
+	Error *string `protobuf:"bytes,1,opt,name=error" json:"error,omitempty"`
+	// A bitmask of supported features that the code generator supports.
+	// This is a bitwise "or" of values from the Feature enum.
+	SupportedFeatures *uint64                       `protobuf:"varint,2,opt,name=supported_features,json=supportedFeatures" json:"supported_features,omitempty"`
+	File              []*CodeGeneratorResponse_File `protobuf:"bytes,15,rep,name=file" json:"file,omitempty"`
 }
 
 func (x *CodeGeneratorResponse) Reset() {
@@ -279,6 +339,13 @@
 	return ""
 }
 
+func (x *CodeGeneratorResponse) GetSupportedFeatures() uint64 {
+	if x != nil && x.SupportedFeatures != nil {
+		return *x.SupportedFeatures
+	}
+	return 0
+}
+
 func (x *CodeGeneratorResponse) GetFile() []*CodeGeneratorResponse_File {
 	if x != nil {
 		return x.File
@@ -429,27 +496,34 @@
 	0x6f, 0x6e, 0x18, 0x03, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x21, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c,
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 	0x15, 0x43, 0x6f, 0x64, 0x65, 0x47, 0x65, 0x6e, 0x65, 0x72, 0x61, 0x74, 0x6f, 0x72, 0x52, 0x65,
 	0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x14, 0x0a, 0x05, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x18,
-	0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x12, 0x48, 0x0a, 0x04,
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+	0x0a, 0x1c, 0x63, 0x6f, 0x6d, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f,
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+	0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x67, 0x6f, 0x6c, 0x61, 0x6e, 0x67, 0x2f,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x2d,
+	0x67, 0x65, 0x6e, 0x2d, 0x67, 0x6f, 0x2f, 0x70, 0x6c, 0x75, 0x67, 0x69, 0x6e, 0x3b, 0x70, 0x6c,
+	0x75, 0x67, 0x69, 0x6e, 0x5f, 0x67, 0x6f,
 }
 
 var (
@@ -464,18 +538,20 @@
 	return file_google_protobuf_compiler_plugin_proto_rawDescData
 }
 
+var file_google_protobuf_compiler_plugin_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
 var file_google_protobuf_compiler_plugin_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
 var file_google_protobuf_compiler_plugin_proto_goTypes = []interface{}{
-	(*Version)(nil),                          // 0: google.protobuf.compiler.Version
-	(*CodeGeneratorRequest)(nil),             // 1: google.protobuf.compiler.CodeGeneratorRequest
-	(*CodeGeneratorResponse)(nil),            // 2: google.protobuf.compiler.CodeGeneratorResponse
-	(*CodeGeneratorResponse_File)(nil),       // 3: google.protobuf.compiler.CodeGeneratorResponse.File
-	(*descriptorpb.FileDescriptorProto)(nil), // 4: google.protobuf.FileDescriptorProto
+	(CodeGeneratorResponse_Feature)(0),       // 0: google.protobuf.compiler.CodeGeneratorResponse.Feature
+	(*Version)(nil),                          // 1: google.protobuf.compiler.Version
+	(*CodeGeneratorRequest)(nil),             // 2: google.protobuf.compiler.CodeGeneratorRequest
+	(*CodeGeneratorResponse)(nil),            // 3: google.protobuf.compiler.CodeGeneratorResponse
+	(*CodeGeneratorResponse_File)(nil),       // 4: google.protobuf.compiler.CodeGeneratorResponse.File
+	(*descriptorpb.FileDescriptorProto)(nil), // 5: google.protobuf.FileDescriptorProto
 }
 var file_google_protobuf_compiler_plugin_proto_depIdxs = []int32{
-	4, // 0: google.protobuf.compiler.CodeGeneratorRequest.proto_file:type_name -> google.protobuf.FileDescriptorProto
-	0, // 1: google.protobuf.compiler.CodeGeneratorRequest.compiler_version:type_name -> google.protobuf.compiler.Version
-	3, // 2: google.protobuf.compiler.CodeGeneratorResponse.file:type_name -> google.protobuf.compiler.CodeGeneratorResponse.File
+	5, // 0: google.protobuf.compiler.CodeGeneratorRequest.proto_file:type_name -> google.protobuf.FileDescriptorProto
+	1, // 1: google.protobuf.compiler.CodeGeneratorRequest.compiler_version:type_name -> google.protobuf.compiler.Version
+	4, // 2: google.protobuf.compiler.CodeGeneratorResponse.file:type_name -> google.protobuf.compiler.CodeGeneratorResponse.File
 	3, // [3:3] is the sub-list for method output_type
 	3, // [3:3] is the sub-list for method input_type
 	3, // [3:3] is the sub-list for extension type_name
@@ -543,13 +619,14 @@
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_google_protobuf_compiler_plugin_proto_rawDesc,
-			NumEnums:      0,
+			NumEnums:      1,
 			NumMessages:   4,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
 		GoTypes:           file_google_protobuf_compiler_plugin_proto_goTypes,
 		DependencyIndexes: file_google_protobuf_compiler_plugin_proto_depIdxs,
+		EnumInfos:         file_google_protobuf_compiler_plugin_proto_enumTypes,
 		MessageInfos:      file_google_protobuf_compiler_plugin_proto_msgTypes,
 	}.Build()
 	File_google_protobuf_compiler_plugin_proto = out.File