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Title: [3.13] gh-138010: Fix `__init_subclass__` forwarding by `warnings.deprecated` (GH-138210) by brianschubert · Pull Request #138564 · python/cpython · GitHub

Open Graph Title: [3.13] gh-138010: Fix `__init_subclass__` forwarding by `warnings.deprecated` (GH-138210) by brianschubert · Pull Request #138564 · python/cpython

X Title: [3.13] gh-138010: Fix `__init_subclass__` forwarding by `warnings.deprecated` (GH-138210) by brianschubert · Pull Request #138564 · python/cpython

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Open Graph Description: (cherry picked from commit e2c038f) Issue: warnings.deprecated leads to incorrectly set _is_protocol on subclasses #138010

X Description: (cherry picked from commit e2c038f) Issue: warnings.deprecated leads to incorrectly set _is_protocol on subclasses #138010

Opengraph URL: https://github.com/python/cpython/pull/138564

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