[3.9] bpo-46032: Check types in singledispatch's register() at declaration time (GH-30050) (GH-30254) - #30255

[3.9] bpo-46032: Check types in singledispatch's register() at declaration time (GH-30050) (GH-30254)#30255

serhiy-storchaka merged 3 commits into

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