[issue43957] [Enum] update __contains__ to return True for valid values

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado <pablogsal at gmail.com>:


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nosy: +pablogsal
nosy_count: 1.0 -> 2.0
pull_requests: +24463
pull_request: https://github.com/python/cpython/pull/25770

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43957>
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