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Title: Fix reachability for frozenset and dict view narrowing by hauntsaninja · Pull Request #21151 · python/mypy · GitHub

Open Graph Title: Fix reachability for frozenset and dict view narrowing by hauntsaninja · Pull Request #21151 · python/mypy

X Title: Fix reachability for frozenset and dict view narrowing by hauntsaninja · Pull Request #21151 · python/mypy

Description: Optional static typing for Python. Contribute to python/mypy development by creating an account on GitHub.

Open Graph Description: Fixes #21143 (on the same lines as #20704, i.e. there still exists a deeper fix that could be made) I also update a comment that is a little out of date since #20863 and code in checkexpr.py that i...

X Description: Fixes #21143 (on the same lines as #20704, i.e. there still exists a deeper fix that could be made) I also update a comment that is a little out of date since #20863 and code in checkexpr.py that i...

Opengraph URL: https://github.com/python/mypy/pull/21151

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Fix reachability for frozenset and dict view narrowinghttps://github.com/python/mypy/pull/21151/commits/8451b92fd6504d5430441d7c7a144d328ac9d89b
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Fix reachability for frozenset and dict view narrowing (https://github.com/python/mypy/commit/6fccffcac0c8c24034d4f2b262ca7e5564ba9375
#21151https://github.com/python/mypy/pull/21151
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Apr 28, 2026 https://github.com/python/mypy/pull/21151#ref-pullrequest-4339999678
Fix narrowing for AbstractSet and Mapping #21352 https://github.com/python/mypy/pull/21352
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Fix narrowing for AbstractSet and Mapping (https://github.com/python/mypy/commit/c4b9a29505430433a6d8b4853bb3c02b42740017
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Fix narrowing for AbstractSet and Mapping (https://github.com/python/mypy/commit/2c9ddae00bd6182c6327ed0b5baf89ff8ffd3197
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chore(deps): update dependency mypy to v1.20.1 (r2026)https://github.com/Intersec/lib-common/commit/aa6c7f527eb61cf06d0b2dc89ceeb0625e56c829
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[1.20 regression] incorrect reachability for comparisons between set and frozenset https://github.com/python/mypy/issues/21143
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