[issue28280] Always return a list from PyMapping_Keys/PyMapping_Values/PyMapping_Items

[Oren Milman]

Oren Milman <orenmn at gmail.com> added the comment:

(for knowledge preservation's sake)
Resolving this issue would also resolve #31486.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28280>
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