Preserve gradual guarantee when narrowing Any union via equality#21368
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ilevkivskyi
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Apr 29, 2026
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Diff from mypy_primer, showing the effect of this PR on open source code: cryptography (https://github.com/pyca/cryptography)
- src/cryptography/hazmat/primitives/serialization/ssh.py:1120: error: Argument 16 to "SSHCertificate" has incompatible type "bytes | Any | memoryview[int]"; expected "bytes" [arg-type]
dd-trace-py (https://github.com/DataDog/dd-trace-py)
- ddtrace/debugging/_function/discovery.py:215: error: Argument 2 to "undecorated" has incompatible type "str | Any | int | type[staticmethod[Any, Any]] | type[classmethod[Any, Any, Any]]"; expected "str" [arg-type]
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JukkaL
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Apr 30, 2026
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Fixes #21364