docs: private static boolean isSeparator(char character, char... separators)
    {
      if(separators.length == 0) {
        separators = DEFAULT_SEPARATORS;
      }
      for(int i = 0; i < separators.length; ++i) {
        if(character == separators[i]) {
          return true;
        }
      }
      return false;
    }