[issue41984] Empty __slots__ can create untracked reference cycles

[Brandt Bucher]

Brandt Bucher <brandtbucher at gmail.com> added the comment:

No problem. I just need to rework some hacks in test_finalization where we use empty __slots__ to create non-GC types. I think I can just create a simple utility in _testcapi to untrack instances for this purpose.

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<https://bugs.python.org/issue41984>
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