[issue22166] test_codecs leaks references

[Nick Coghlan]

Nick Coghlan added the comment:

This investigation also showed why the original tests that used a
non-unique name didn't work: the codec was getting cached the first time
through and hence not seeing the different codecs registered by other tests.

MAL, my plan was to provide an API to forget a specific named codec rather
than flush the whole cache. I agree a private C API would also be a good
idea, though.

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<http://bugs.python.org/issue22166>
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