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Title: gh-138010: Fix `__init_subclass__` forwarding by `warnings.deprecated` by brianschubert · Pull Request #138210 · python/cpython · GitHub

Open Graph Title: gh-138010: Fix `__init_subclass__` forwarding by `warnings.deprecated` by brianschubert · Pull Request #138210 · python/cpython

X Title: gh-138010: Fix `__init_subclass__` forwarding by `warnings.deprecated` by brianschubert · Pull Request #138210 · python/cpython

Description: The Python programming language. Contribute to python/cpython development by creating an account on GitHub.

Open Graph Description: Issue: warnings.deprecated leads to incorrectly set _is_protocol on subclasses #138010

X Description: Issue: warnings.deprecated leads to incorrectly set _is_protocol on subclasses #138010

Opengraph URL: https://github.com/python/cpython/pull/138210

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