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The following patterns still break mypy: 1. `type[]` at top level fails 2. `tuple[T1, T2]` at top level fails (but `tuple[T1, ...]` is fine) 3. `T1 | Callable[..., T2 | T3]` fails, but only <=3.9 This PR cleans up usage of `Union` and `Optional` outside these patterns.