/* CRIAL
  SERIALIZER_BEGIN
    mpkutil_pack_str(packer, "$name");
    $code_pack(&player->$name, packer);
  END
  DESERIALIZER_BEGIN
    if (!$code_unpack(
          &player->$name, mpkutil_get_map_item_by_str(root, "$name"))) {
      return false;
    }
  END
  PROPERTY stances = loplayer_stance_set
  PROPERTY event   = loplayer_event
*/