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Title: [3.14] gh-138010: Fix `__init_subclass__` forwarding by `warnings.deprecated` (GH-138210) by miss-islington · Pull Request #138561 · python/cpython · GitHub

Open Graph Title: [3.14] gh-138010: Fix `__init_subclass__` forwarding by `warnings.deprecated` (GH-138210) by miss-islington · Pull Request #138561 · python/cpython

X Title: [3.14] gh-138010: Fix `__init_subclass__` forwarding by `warnings.deprecated` (GH-138210) by miss-islington · Pull Request #138561 · python/cpython

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Open Graph Description: (cherry picked from commit e2c038f) Co-authored-by: Brian Schubert brianm.schubert@gmail.com Issue: warnings.deprecated leads to incorrectly set _is_protocol on subclasses #138010

X Description: (cherry picked from commit e2c038f) Co-authored-by: Brian Schubert brianm.schubert@gmail.com Issue: warnings.deprecated leads to incorrectly set _is_protocol on subclasses #138010

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