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

[Oren Milman]

Change by Oren Milman <orenmn at gmail.com>:


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keywords: +patch
pull_requests: +3821
stage:  -> patch review

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