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## Summary The exact behavior around what's allowed vs. disallowed was partly detected through trial and error in the runtime. I was a little confused by [this comment](https://github.com/python/cpython/pull/129352) that says "`NamedTuple` subclasses cannot be inherited from" because in practice that doesn't appear to error at runtime. Closes [#1683](https://github.com/astral-sh/ty/issues/1683).
ty
ty is an extremely fast type checker. Currently, it is a work-in-progress and not ready for production use.
The Rust code for ty lives in this repository; see CONTRIBUTING.md for more information on contributing to ty.
See the ty repo for ty documentation and releases.