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Add type narrowing for `!=` expression as stated in #13694. ### Test Plan Add tests in new md format. --------- Co-authored-by: David Peter <mail@david-peter.de>
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.