Refactor equality and identity narrowing for clarity #20595
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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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This is a follow up to #20492 that is pure refactoring. I separated it out to make that change easier to review. We inline
narrow_identity_equality_comparison, improve comments, etc.There is some further refactoring later in my commit stack too.