/* CRIAL
  SERIALIZER_BEGIN
    mpkutil_pack_str(packer, "$name");
    LOCOMMON_MSGPACK_PACK_ANY(packer, &param->$code);
  END
  DESERIALIZER_BEGIN
    if (!LOCOMMON_MSGPACK_UNPACK_ANY(
          mpkutil_get_map_item_by_str(root, "$name"), &param->$code)) {
      return false;
    }
  END
  PROPERTY target
*/