Support default type parameters in Generic - #795
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## main #795 +/- ##
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- Coverage 97.26% 97.24% -0.03%
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Lines 7859 7905 +46
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Fixes #672
On Python 3.9–3.12, typing's generic specialization path does not invoke the default-substitution hooks exposed by typing_extensions.TypeVar. Apply those hooks for generic classes and aliases before delegating to typing, so omitted parameters use their declared defaults.
Tests: Python 3.9 and 3.10
python -m unittest test_typing_extensions.TypeVarLikeDefaultsTests; Python 3.14 same.