[issue39441] mimetypes.guess_extension unable to get non-lowercase mimetype

[Irit Katriel]

Irit Katriel <iritkatriel at gmail.com> added the comment:

See also Issue20392.

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nosy: +iritkatriel

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39441>
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