types/dynamicpb: fix message Zero return type to read-only
Changes the message Zero return type to be read-only by omitting internal known map.
Change-Id: I1c1191a125df74251be3d8bb70f4b06c1ff57070
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/223857
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
diff --git a/types/dynamicpb/dynamic.go b/types/dynamicpb/dynamic.go
index 86371cf..2a41fc8 100644
--- a/types/dynamicpb/dynamic.go
+++ b/types/dynamicpb/dynamic.go
@@ -323,7 +323,7 @@
}
func (mt messageType) New() pref.Message { return NewMessage(mt.desc) }
-func (mt messageType) Zero() pref.Message { return NewMessage(mt.desc) }
+func (mt messageType) Zero() pref.Message { return &Message{typ: messageType{mt.desc}} }
func (mt messageType) Descriptor() pref.MessageDescriptor { return mt.desc }
type emptyList struct {
