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Title: Remove `list.__add__` overloads. by randolf-scholz · Pull Request #14282 · python/typeshed · GitHub

Open Graph Title: Remove `list.__add__` overloads. by randolf-scholz · Pull Request #14282 · python/typeshed

X Title: Remove `list.__add__` overloads. by randolf-scholz · Pull Request #14282 · python/typeshed

Description: Collection of library stubs for Python, with static types - Remove `list.__add__` overloads. by randolf-scholz · Pull Request #14282 · python/typeshed

Open Graph Description: See #14283. The overloads on list.__add__ lead to divergence of mypy and pyright. Code sample in pyright playground, https://mypy-play.net/?mypy=latest&python=3.12&gist=abf6a8834020af17a16b...

X Description: See #14283. The overloads on list.__add__ lead to divergence of mypy and pyright. Code sample in pyright playground, https://mypy-play.net/?mypy=latest&python=3.12&gist=abf6a8834020...

Opengraph URL: https://github.com/python/typeshed/pull/14282

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og:image:altSee #14283. The overloads on list.__add__ lead to divergence of mypy and pyright. Code sample in pyright playground, https://mypy-play.net/?mypy=latest&python=3.12&gist=abf6a8834020af17a16b...
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polymorphic overloads on list.__add__ and dict.__or__ lead to divergences in type checkers. #14283 https://github.com/python/typeshed/issues/14283
remove dict.__or__ overloads #14284 https://github.com/python/typeshed/pull/14284
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Take this example from the mypy primer abovehttps://github.com/python/mypy/blob/master/mypyc/crash.py
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Jun 16, 2025 https://github.com/python/typeshed/pull/14282#ref-issue-3149932114
Assigning to intermediate variable changes type checking results python/mypy#19304 https://github.com/python/mypy/issues/19304
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