a24a4b55ee
## Summary Add support for `typing.ReadOnly` as a type qualifier to mark `TypedDict` fields as being read-only. If you try to mutate them, you get a new diagnostic: <img width="787" height="234" alt="image" src="https://github.com/user-attachments/assets/f62fddf9-4961-4bcd-ad1c-747043ebe5ff" /> ## Test Plan * New Markdown tests * The typing conformance changes are all correct. There are some false negatives, but those are related to the missing support for the functional form of `TypedDict`, or to overriding of fields via inheritance. Both of these topics are tracked in https://github.com/astral-sh/ty/issues/154
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/ty_test/README.md for documentation of this test format.