[issue16845] warnings.simplefilter should validate input

[Bonifacio]

Change by Bonifacio <bonifacio.segundo at gmail.com>:


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keywords: +patch
nosy: +Bonifacio2
nosy_count: 3.0 -> 4.0
pull_requests: +25281
pull_request: https://github.com/python/cpython/pull/26696

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue16845>
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