Narrow literals in the negative case even with custom equality #18574
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A5rocks
commented
Jan 30, 2025
| if should_narrow_by_identity: | ||
| return True | ||
| else: | ||
| return not p_t.fallback.type.is_enum |
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Alternative: I could try has_no_custom_eq_checks(p_t.fallback) maybe?
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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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Fixes #16465
Fixes #18029
Fixes #17229
Generally, people cannot replace a literal's equality. So negative narrowing is still safe. (not the case for enum literals, so those don't get this treatment)