[issue22166] test_codecs leaks references

[Nick Coghlan]

Nick Coghlan added the comment:

Yeah, I'm wary of the GC hack as well. It's a nice way to prove that this the internal cache is the problem, but probably not something we want to commit.

A "codecs._forget_codec" helper in the C module would be all that was needed to handle it. Other implementations could then also use that to clear their own internal cache (if they have one).

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