[issue21574] Port image types detections from PIL to the imghdr module

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

This issue is 5 years old and has patches: it is no newcomer friendly, I remove the "easy" keyword.

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keywords:  -easy
nosy: +vstinner

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue21574>
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