Support ==-based narrowing of Optional
#18163
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Closes python#18135 This change implements the third approach mentioned in python#18135, which is stricter than similar narrowings, as clarified by the new/modified code comments. Personally, I prefer this more stringent way but could also switch this PR to approach two if there is a consent that convenience is more important than type safety here.
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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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Closes #18135
This change implements the third approach mentioned in #18135, which is stricter than similar narrowings, as clarified by the new/modified code comments. Personally, I prefer this more stringent way but could also switch this PR to approach two if there is consent that convenience is more important than type safety here.