[issue31538] mailbox does not treat external factories the same

[Henk-Jaap Wagenaar]

Change by Henk-Jaap Wagenaar <superhenkjaap at gmail.com>:


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keywords: +patch
nosy: +Cryvate
nosy_count: 4.0 -> 5.0
pull_requests: +25362
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/26776

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31538>
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