docs: def __type2str(type_, buf, _, tbl):
      """https://github.com/thom311/libnl/blob/libnl3_2_25/lib/utils.c#L968.
  
      Positional arguments:
      type_ -- integer, key to lookup in `tbl`.
      buf -- bytearray().
      _ -- unused.
      tbl -- dict.
  
      Returns:
      Reference to `buf`.
      """
      del buf[:]
      if type_ in tbl:
          buf.extend(tbl[type_].encode('ascii'))
      else:
          buf.extend('0x{0:x}'.format(type_).encode('ascii'))
      return buf