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Title: gh-124787: Fix `TypeAliasType` and incorrect `type_params` by sobolevn · Pull Request #124795 · python/cpython · GitHub

Open Graph Title: gh-124787: Fix `TypeAliasType` and incorrect `type_params` by sobolevn · Pull Request #124795 · python/cpython

X Title: gh-124787: Fix `TypeAliasType` and incorrect `type_params` by sobolevn · Pull Request #124795 · python/cpython

Description: Issue: TypeAliasType with should also raise an error if non-default type parameter follows default type parameter #124787

Open Graph Description: Issue: TypeAliasType with should also raise an error if non-default type parameter follows default type parameter #124787

X Description: Issue: TypeAliasType with should also raise an error if non-default type parameter follows default type parameter #124787

Opengraph URL: https://github.com/python/cpython/pull/124795

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TypeAliasType with should also raise an error if non-default type parameter follows default type parameter #124787https://github.com/python/cpython/issues/124787
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TypeAliasType with should also raise an error if non-default type parameter follows default type parameter #124787 https://github.com/python/cpython/issues/124787
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[3.14] Address invalid inputs of TypeAliasType python/typing_extensions#477 https://github.com/python/typing_extensions/pull/477
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