Alex Waygood <alex.wayg...@gmail.com> added the comment:

Guido: Serhiy fixed this very recently in Issue46032.

The documentation should probably be improved, however, in my opinion; there's 
currently nothing officially stating that GenericAlias/NewType/typing aliases 
are unsupported.

Support for singledispatch.register(union_type) was also recently added in 
Issue46014, but has yet to be documented.

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<https://bugs.python.org/issue34498>
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