docs: def rotunicode(io_object, decode=False):
      """Rotate ASCII <-> non-ASCII characters in a file.
  
      :param io_object:
          The file object to convert.
      :type io_object:
          :class:`io.TextIOWrapper`
      :param decode:
          If True, perform a rotunicode-decode (rotate from non-ASCII to ASCII).
          Defaults to False (rotate from ASCII to non-ASCII).
      :type decode:
          `bool`
      :return:
          Yield the converted lines of the file.
      :rtype:
          `generator` of `unicode`
      """
      rotu_fn = get_rotunicode_function_for_decode_argument(decode=decode)
      return map(rotu_fn, map(safe_unicode, stream_file_lines(io_object)))