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Title: Add some additional narrowing test cases by hauntsaninja · Pull Request #20598 · python/mypy · GitHub

Open Graph Title: Add some additional narrowing test cases by hauntsaninja · Pull Request #20598 · python/mypy

X Title: Add some additional narrowing test cases by hauntsaninja · Pull Request #20598 · python/mypy

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Open Graph Description: Requested in #20492 (comment) Regression for the Never's in #18524 (comment)

X Description: Requested in #20492 (comment) Regression for the Never's in #18524 (comment)

Opengraph URL: https://github.com/python/mypy/pull/20598

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Add some additional narrowing test caseshttps://github.com/python/mypy/pull/20598#top
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Jan 16, 2026https://github.com/python/mypy/pull/20598#issue-3823640304
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#20492 (comment)https://github.com/python/mypy/pull/20492#discussion_r2699572287
#18524 (comment)https://github.com/python/mypy/issues/18524#issuecomment-2613070787
Please reload this pagehttps://github.com/python/mypy/pull/20598
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Expand upon narrowing TypeVar to type object test casehttps://github.com/python/mypy/pull/20598/commits/4f29fc8fe2586a7a9d8df93f8491e613f6492ca4
4f29fc8https://github.com/python/mypy/pull/20598/commits/4f29fc8fe2586a7a9d8df93f8491e613f6492ca4
Rework narrowing logic for equality and identity #20492 https://github.com/python/mypy/pull/20492
Better narrowing #20564 https://github.com/python/mypy/issues/20564
https://github.com/hauntsaninja
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Jan 16, 2026https://github.com/python/mypy/pull/20598#event-22105443150
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January 16, 2026 13:08https://github.com/python/mypy/pull/20598#commits-pushed-d94972c
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Jan 16, 2026 https://github.com/python/mypy/pull/20598#ref-issue-3823693450
Regression with Narrowing (Test Cases) #20600 https://github.com/python/mypy/issues/20600
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c72d4f1https://github.com/python/mypy/commit/c72d4f1dee65dce69a78345c77632da95b613bb6
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