[issue35474] mimetypes.guess_all_extensions potentially mutates list

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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keywords: +patch
nosy: +serhiy.storchaka
nosy_count: 1.0 -> 2.0
pull_requests: +26702
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/28286

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<https://bugs.python.org/issue35474>
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