docs: private void addError(int code, String key) {
  
          errorCodes = (int[]) ArrayUtil.resizeArray(errorCodes,
                  errorCodes.length + 1);
          errorKeys = (String[]) ArrayUtil.resizeArray(errorKeys,
                  errorKeys.length + 1);
          errorCodes[errorCodes.length - 1] = code;
          errorKeys[errorKeys.length - 1]   = key;
      }