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

[STINNER Victor]

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

codecs.unregister() is needed to write unit tests: see PR 19069 of bpo-39337.

I don't see a strong need to add a new codecs.unregister_error() function, excpet for completeness. I don't think that completeness is enough to justify to add the function, but feel free to open a new issue if you consider that it's really needed.

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