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## Summary Allow (instances of) subclasses of `Any` and `Unknown` to be assignable to (instances of) other classes, unless they are final. This allows us to get rid of ~1000 false positives, mostly when mock-objects like `unittest.mock.MagicMock` are assigned to various targets. ## Test Plan Adapted and new Markdown tests.
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/red_knot_test/README.md for documentation of this test format.