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Fix ternary union for literals by ilevkivskyi · Pull Request #18023 · python/mypy · GitHub
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Fixes #18021

When I switched to (almost) always using unions as inferred from ternary expressions, I had a choice, because before we used either full context (i.e. l.h.s.) or the if type to infer the else type. After some playing I found the second one usually works better. But as we see this is not always the case, so I add some special-casing.

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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

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@JukkaL JukkaL left a comment

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Thanks for the quick fix!

@JukkaL JukkaL merged commit 3420ef1 into python:master Oct 24, 2024
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@ilevkivskyi ilevkivskyi deleted the fix-ternaly-literal branch October 26, 2024 22:04
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[1.12] Regression in is None narrowing

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