Fix reliance on unspecified behavior in test_disambiguators.py#642
Merged
Tinche merged 1 commit intopython-attrs:mainfrom Mar 31, 2025
Merged
Fix reliance on unspecified behavior in test_disambiguators.py#642Tinche merged 1 commit intopython-attrs:mainfrom
Tinche merged 1 commit intopython-attrs:mainfrom
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See python/cpython#131933. Python does not guarantee that running `Union[A, B]` twice gives the same object back. This test is currently broken in Python 3.14 main.
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Cool, thanks. I wonder if there's user code in the wild that relies on this behavior though - cattrs supports matching types by predicate functions, so folks might have working predicates that use Taking a broader view, it's also just a little unfortunate in that |
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Thanks for merging the PR!
Possibly, but I don't think this is terribly inconsistent with how Python works in general. It's also true that |
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See python/cpython#131933. Python does not guarantee that running
Union[A, B]twice gives the same object back. This test is currently broken in Python 3.14 main.