[issue42536] Iterating on a zip keeps objects alive longer than expected (test_itertools leaks sometimes references)

[Brandt Bucher]

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

> I add Pablo and Tim who love GC puzzles.

Well, I don’t think the GC is really doing anything wrong here... untracking these sort of tuples likely results in a noticeable reduction in collection times. This code is definitely testing the limits of what is “okay” for us to do with a tuple, and it’s breaking the GC’s (reasonable) assumptions.

I kept digging around, and it appears dict.items() is affected, too (which is a bit scarier). The same fix still works, though.

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<https://bugs.python.org/issue42536>
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