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## Summary Allow values of type `None` in type expressions. The [typing spec](https://typing.python.org/en/latest/spec/annotations.html#type-and-annotation-expressions) could be more explicit on whether this is actually allowed or not, but it seems relatively harmless and does help in some use cases like: ```py try: from module import MyClass except ImportError: MyClass = None # ty: ignore def f(m: MyClass): pass ``` ## Test Plan Updated tests, ecosystem check.