code: private int _nextCh()
              throws IOException, JsonParseException
      {
          if (_inputPtr < _inputEnd || loadMore()) {
              return _inputBuffer[_inputPtr++];
          }
          throw _constructError("Unexpected end-of-input within/between " + _parsingContext.getTypeDesc() + " entries");
      }
docs: /*
  ********************************************************
  /* Internal methods, other parsing
  ********************************************************