[issue46014] functools.singledispatch does not support Union types

[Alex Waygood]

Alex Waygood <Alex.Waygood at Gmail.com> added the comment:

```
>>> from typing import Optional, get_origin
>>> get_origin(Optional[int])
typing.Union
```

^Because of that, it will work with typing.Optional as well as typing.Union and types.UnionType, yes.

I am planning on submitting a docs PR at some point in the next few days (probably linked to a new BPO issue).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46014>
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