[issue36560] test_functools leaks randomly 1 memory block

[STINNER Victor]

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

> _abc was written for optimization. Your PR makes it using slower Python code. Could you please test how much this hits the performance of abc?

I mostly wrote PR 12743 to debug this issue. Please see the discussion directly on the PR ;-)

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