docs: public String toVoJSONString(boolean pretty) {
          if (pretty) {
              return JSON.toJSONStringWithDateFormat(toVoJSONObject(), Constant.DATE_SERIALIZE_FORMAT, SerializerFeature.PrettyFormat);
          } else {
              return JSONObject.toJSONStringWithDateFormat(toVoJSONObject(), Constant.DATE_SERIALIZE_FORMAT);
          }
      }