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Improve narrowing logic for Enum int and str subclasses - #20609
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hauntsaninja merged 1 commit intoJan 21, 2026
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Diff from mypy_primer, showing the effect of this PR on open source code: schemathesis (https://github.com/schemathesis/schemathesis)
- src/schemathesis/generation/coverage.py: note: In member "is_valid_for_location" of class "CoverageContext":
- src/schemathesis/generation/coverage.py:258: error: Statement is unreachable [unreachable]
- src/schemathesis/generation/coverage.py: note: In member "leads_to_negative_test_case" of class "CoverageContext":
- src/schemathesis/generation/coverage.py:264: error: Statement is unreachable [unreachable]
- src/schemathesis/generation/coverage.py: note: In member "will_be_serialized_to_string" of class "CoverageContext":
- src/schemathesis/generation/coverage.py:272: error: Right operand of "and" is never evaluated [unreachable]
- src/schemathesis/generation/coverage.py: note: In function "_positive_string":
- src/schemathesis/generation/coverage.py:958: error: Statement is unreachable [unreachable]
- src/schemathesis/generation/coverage.py: note: In function "_negative_format":
- src/schemathesis/generation/coverage.py:1496: error: Statement is unreachable [unreachable]
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hauntsaninja
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Jan 17, 2026
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mypy/checker.py
| if t.last_known_value: | ||
| result.update(ambiguous_enum_equality_keys(t.last_known_value)) | ||
| elif t.type.is_enum and any( | ||
| base.fullname in ("enum.IntEnum", "enum.StrEnum", "builtins.str", "builtins.int") |
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this is important line in the diff / review without whitespace changes
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JukkaL
approved these changes
Jan 21, 2026
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Fixes some of the primer regressions from #20492
Fixes #19753
This should also happen to fix the case mentioned by cdce8p in #20492 (comment)