[issue40273] mappingproxy isn't reversible

[Zackery Spytz]

Change by Zackery Spytz <zspytz at gmail.com>:


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keywords: +patch
nosy: +ZackerySpytz
nosy_count: 2.0 -> 3.0
pull_requests: +18866
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/19513

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40273>
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