[issue43220] Explicit default required arguments with add_mutually_exclusive_group are rejected

[Keith Smiley]

Change by Keith Smiley <keithbsmiley at gmail.com>:


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keywords: +patch
pull_requests: +23311
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/24526

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43220>
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