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…python#158000) Add a regression test to make sure isinstance() reads the items of a tuple subclass directly, without calling its __iter__(), __getitem__() or __len__(). (cherry picked from commit 21a36aa)
This was referenced Oct 16, 2026
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The test is a guard against future regressions and does not need backporting. |
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Manual backport of #158000 to 3.13.
The conflict was only in the surrounding context of
Lib/test/test_isinstance.py.cc @methane