docs: def kuten_to_gb2312(kuten):
      """
      Convert GB kuten / quwei form (94 zones * 94 points) to GB2312-1980 /
      ISO-2022-CN hex (internal representation)
      """
      zone, point = int(kuten[:2]), int(kuten[2:])
      hi, lo = hexd(zone + 0x20), hexd(point + 0x20)
  
      gb2312 = "%s%s" % (hi, lo)
  
      assert isinstance(gb2312, bytes)
      return gb2312