gh-74690: Make a typing test more resilient #104691
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AlexWaygood
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While backporting #104622 to
typing_extensions(python/typing_extensions#161), I discovered that one of the tests I added in #104622 fails on PyPy due to small differences in PyPy's implementation ofabc.ABCMeta. Tests in CPython's test suite should generally be implementation-agnostic unless a test is explicitly marked with@test.support.cpython_only(or similar), so let's adapt the test so that it works equally well on alternative implementations.