docs: public static boolean isBlankJson(final Object obj) {
          if (obj == null) {
              return true;
          }
          if(obj instanceof Collection) {
              return (((Collection) obj).size() == 0);
          }
          if(obj instanceof Map) {
              return (((Map) obj).size() == 0);
          }
          throw new UnsupportedOperationException("map or list is supported, got ${obj?obj.getClass():null}");
      }