Don't use equality to narrow when value is IntEnum/StrEnum #17866
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IntEnum/StrEnum values compare equal to the corresponding int/str values, which breaks the logic we use for narrowing based on equality to a literal value. Special case IntEnum/StrEnum to avoid the incorrect behavior. Fix #17860.
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Diff from mypy_primer, showing the effect of this PR on open source code: optuna (https://github.com/optuna/optuna)
+ tests/storages_tests/test_heartbeat.py:72: error: Unused "type: ignore" comment [unused-ignore]
+ tests/storages_tests/test_heartbeat.py:229: error: Unused "type: ignore" comment [unused-ignore]
psycopg (https://github.com/psycopg/psycopg)
+ tests/test_pipeline_async.py:57: error: Unused "type: ignore" comment [unused-ignore]
+ tests/test_pipeline.py:60: error: Unused "type: ignore" comment [unused-ignore]
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svalentin
approved these changes
Oct 2, 2024
JukkaL
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Oct 4, 2024
Fix regression in #17866. It should still be possible to narrow IntEnum and StrEnum types, but only when types match or are disjoint. Add more logic to rule out narrowing when types are ambigous.
JukkaL
added a commit
that referenced
this pull request
Oct 4, 2024
Fix regression introduced in #17866. It should still be possible to narrow IntEnum and StrEnum types, but only when types match or are disjoint. Add more logic to rule out narrowing when types are ambigous.
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IntEnum/StrEnum values compare equal to the corresponding int/str values, which breaks the logic we use for narrowing based on equality to a literal value. Special case IntEnum/StrEnum to avoid the incorrect behavior.
Fix #17860.