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Title: Better narrowing with custom equality by hauntsaninja · Pull Request #20643 · python/mypy · GitHub

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Open Graph Description: Relates to this comment from A5rocks: #20492 (comment) Fixes #20532 Fixes #18029 Fixes #17229 Fixes #16465 Closes #18574

X Description: Relates to this comment from A5rocks: #20492 (comment) Fixes #20532 Fixes #18029 Fixes #17229 Fixes #16465 Closes #18574

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Jan 27, 2026https://github.com/python/mypy/pull/20643#issuecomment-3807128661
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January 27, 2026 19:34https://github.com/python/mypy/pull/20643#event-22326758532
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#20659https://github.com/python/mypy/pull/20659
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Optional bytes type not narrowed after asserting equality #20701 https://github.com/python/mypy/issues/20701
Short term fix for bytes narrowing #20704 https://github.com/python/mypy/pull/20704
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Feb 2, 2026 https://github.com/python/mypy/pull/20643#ref-commit-ec4c463
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Short term fix for bytes narrowing (https://github.com/python/mypy/commit/ec4c463861fd8683f85fa0c34929e8fca499530f
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Feb 6, 2026 https://github.com/python/mypy/pull/20643#ref-pullrequest-3904386658
Fix bug when narrowing union containing custom eq against custom eq #20754 https://github.com/python/mypy/pull/20754
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Feb 6, 2026 https://github.com/python/mypy/pull/20643#ref-commit-525c6d1
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Fix bug when narrowing union containing custom eq against custom eq (https://github.com/python/mypy/commit/525c6d16e470ad2a2ff38afaf936bdc32528d50d
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False positive with warn unreachable, Any, and None https://github.com/python/mypy/issues/20532
[1.12, 1.13] Regression in enum narrowing https://github.com/python/mypy/issues/18029
__eq__ methods disable narrowing in the else block https://github.com/python/mypy/issues/17229
Type-narrowing Union with Literal using comparison to Literal variable https://github.com/python/mypy/issues/16465
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