diff --git a/internal/workflow/workflow.go b/internal/workflow/workflow.go
index dba91f3..ed436be 100644
--- a/internal/workflow/workflow.go
+++ b/internal/workflow/workflow.go
@@ -202,8 +202,7 @@
 
 func (p parameter[T]) valueType(T) {}
 func (p parameter[T]) typ() reflect.Type {
-	var zero T
-	return reflect.TypeOf(zero)
+	return reflect.TypeFor[T]()
 }
 func (p parameter[T]) value(w *Workflow) reflect.Value { return reflect.ValueOf(w.params[p.d.Name]) }
 func (p parameter[T]) ready(w *Workflow) bool          { return true }
@@ -303,7 +302,7 @@
 
 func (c *constant[T]) valueType(T) {}
 func (c *constant[T]) typ() reflect.Type {
-	return reflect.TypeFor[[]T]()
+	return reflect.TypeFor[T]()
 }
 func (c *constant[T]) value(_ *Workflow) reflect.Value { return reflect.ValueOf(c.v) }
 func (c *constant[T]) ready(_ *Workflow) bool          { return true }
@@ -434,7 +433,7 @@
 func (er *expansionResult[T]) valueType(T) {}
 
 func (er *expansionResult[T]) typ() reflect.Type {
-	return reflect.TypeFor[[]T]()
+	return reflect.TypeFor[T]()
 }
 
 func (er *expansionResult[T]) value(w *Workflow) reflect.Value {
@@ -622,7 +621,7 @@
 func (tr *taskResult[T]) valueType(T) {}
 
 func (tr *taskResult[T]) typ() reflect.Type {
-	return reflect.TypeFor[[]T]()
+	return reflect.TypeFor[T]()
 }
 
 func (tr *taskResult[T]) value(w *Workflow) reflect.Value {