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Common "experts" - feedback needed!
Original
test test_utf8_mode failed -- Traceback (most recent call last):
 File "/data/prj/python/git/python3-3.8/Lib/test/test_utf8_mode.py", line 225, in test_cmd_line
 check('utf8=0', [c_arg], LC_ALL='C')
 File "/data/prj/python/git/python3-3.8/Lib/test/test_utf8_mode.py", line 217, in check
 self.assertEqual(args, ascii(expected), out)
AssertionError: "['h\\xc3\\xa9\\xe2\\x82\\xac']" != "['h\\udcc3\\udca9\\udce2\\udc82\\udcac']"
- ['h\xc3\xa9\xe2\x82\xac']
+ ['h\udcc3\udca9\udce2\udc82\udcac']
 : ISO8859-1:['h\xc3\xa9\xe2\x82\xac']
Modification #1:
 if sys.platform == 'darwin' or support.is_android:
 c_arg = arg_utf8
 elif sys.platform.startswith("aix"):
 c_arg = arg_ascii.encode('utf-8', 'surrogateescape')
 else:
 c_arg = arg_ascii
 check('utf8=0', [c_arg], LC_ALL='C')
Result:
AssertionError: "['h\\xc3\\xa9\\xe2\\x82\\xac']" != "[b'h\\xc3\\xa9\\xe2\\x82\\xac']"
- ['h\xc3\xa9\xe2\x82\xac']
+ [b'h\xc3\xa9\xe2\x82\xac']
? +
 : ISO8859-1:['h\xc3\xa9\xe2\x82\xac']
Modifiction #2:
 if sys.platform == 'darwin' or support.is_android:
 c_arg = arg_utf8
 elif sys.platform.startswith("aix"):
 c_arg = arg
 else:
 c_arg = arg_ascii
 check('utf8=0', [c_arg], LC_ALL='C')
AssertionError: "['h\\xc3\\xa9\\xe2\\x82\\xac']" != "[b'h\\xc3\\xa9\\xe2\\x82\\xac']"
- ['h\xc3\xa9\xe2\x82\xac']
+ [b'h\xc3\xa9\xe2\x82\xac']
? +
 : ISO8859-1:['h\xc3\xa9\xe2\x82\xac']
The "expected" continues to be a "bytes" object, while the CLI code returns a non-byte string.
Or - the original has an ascii string object but uses \udc rather than \x
\udc is common (i.e., I see it frequently in googled results on other things) - should something in ascii() be changed to output \udc rather than \x ?
Thx!