[issue44490] PEP 604 Union (int | str) doesn't have __parameters__

[Jelle Zijlstra]

Jelle Zijlstra <jelle.zijlstra at gmail.com> added the comment:

I agree that this is a bug. `types.Union` is also missing a __getitem__ implementation.

And `typing.Union` supports pickling while `types.Union` doesn't:

>>> pickle.loads(pickle.dumps(int | str))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot pickle 'types.Union' object
>>> pickle.loads(pickle.dumps(Union[int, str]))
typing.Union[int, str]

I don't have a use case for pickling types but someone might.

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<https://bugs.python.org/issue44490>
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