[issue33989] ms.key_compare is not initialized in all pathes of list_sort_impl

[Elliot Gorokhovsky]

Elliot Gorokhovsky <elliot.gorokhovsky at gmail.com> added the comment:

You can always fall back on safe_object_compare. So unless there's an
obvious reason why your edge case can't be triggered, it would be worth
putting that in as a failsafe. The additional branch should be 100%
predictable, so there shouldn't be any performance penalty.

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<https://bugs.python.org/issue33989>
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