References: google.golang.org/protobuf/internal/genid.GoFeatures_LegacyUnmarshalJsonEnum_field

const google.golang.org/protobuf/internal/genid.GoFeatures_LegacyUnmarshalJsonEnum_field_fullname

one use

	google.golang.org/protobuf/internal/genid (current package)
		go_features_gen.go#L27: 	GoFeatures_LegacyUnmarshalJsonEnum_field_fullname protoreflect.FullName = "pb.GoFeatures.legacy_unmarshal_json_enum"

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