code: @Nonnull
    @ReturnsMutableObject ("design")
    static byte [] _getDecodabet (final int options)
    {
      if ((options & URL_SAFE) == URL_SAFE)
        return _URL_SAFE_DECODABET;
      if ((options & ORDERED) == ORDERED)
        return _ORDERED_DECODABET;
      return _STANDARD_DECODABET;
    }
docs: Returns one of the _SOMETHING_DECODABET byte arrays depending on the
  options specified. It's possible, though silly, to specify ORDERED and
  URL_SAFE in which case one of them will be picked, though there is no
  guarantee as to which one will be picked.