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Title: Revert class lookup by youknowone · Pull Request #7306 · RustPython/RustPython · GitHub

Open Graph Title: Revert class lookup by youknowone · Pull Request #7306 · RustPython/RustPython

X Title: Revert class lookup by youknowone · Pull Request #7306 · RustPython/RustPython

Description: wrong optimization Summary by CodeRabbit Improvements Made isinstance/issubclass checks more consistent by always resolving an object’s class via attribute lookup. This reduces edge-case inconsistencies for objects with custom attribute access or modified class mechanisms, improving reliability and predictability when checking types across dynamic or altered class hierarchies.

Open Graph Description: wrong optimization Summary by CodeRabbit Improvements Made isinstance/issubclass checks more consistent by always resolving an object’s class via attribute lookup. This reduces edge-case inconsi...

X Description: wrong optimization Summary by CodeRabbit Improvements Made isinstance/issubclass checks more consistent by always resolving an object’s class via attribute lookup. This reduces edge-case inconsi...

Opengraph URL: https://github.com/RustPython/RustPython/pull/7306

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863fd73 Revert __class__ lookup skip in object_isinstance youknowone Mar 1, 2026 https://github.com/RustPython/RustPython/pull/7306/commits/863fd73034fed799fa1c067e95a71b999a69cabd
864bf57 Collapse nested if in object_isinstance for clippy youknowone Mar 2, 2026 https://github.com/RustPython/RustPython/pull/7306/commits/864bf57b0c6e4891d203f82e8982c697f588e07a
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