[issue41842] Add codecs.unregister() to unregister a codec search function

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

PR 22360 required 15 iterations (15 commits) and it changes a lot of code. I wouldn't say that it's an "easy (C)" issue.

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<https://bugs.python.org/issue41842>
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