message: fixed tag sign
diff: @@ -347,7 +347,7 @@ static void CreateValuesUnion(const JSONCreateFunctionData &info, yyjson_mut_doc
  if (!tag_data.validity.RowIsValid(tag_idx)) {
  continue;
  }
  - auto tag = ((int8_t *)tag_data.data)[tag_idx];
  + auto tag = ((uint8_t *)tag_data.data)[tag_idx];
  if (tag != member_idx) {
  continue;
  }
  