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Title: bpo-44791: Accept ellipsis as the last argument of Concatenate by serhiy-storchaka · Pull Request #30969 · python/cpython · GitHub

Open Graph Title: bpo-44791: Accept ellipsis as the last argument of Concatenate by serhiy-storchaka · Pull Request #30969 · python/cpython

X Title: bpo-44791: Accept ellipsis as the last argument of Concatenate by serhiy-storchaka · Pull Request #30969 · python/cpython

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Backport allowing passing an ellipsis as the last argument of Concatenate to 3.10 python/typing_extensions#110 https://github.com/python/typing_extensions/issues/110
Type Aliases that are generic over ParamSpec don't work python/mypy#11855 https://github.com/python/mypy/issues/11855
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