func asMyProtoValue(s *structpb.Struct) *myProtoValue {
	return &myProtoValue{
		&structpb.Value{
			Kind: &structpb.Value_StructValue{
				StructValue: s,
			},
		},
	}
}

func (v *myProtoValue) keyAsString(key string) string {
	s := v.keyAsStruct(key)
	return s.GetStringValue()
}