Comment by zem

these are two different issues. supporting django involves adding a special-case module that essentially replicates its code generation and then adds that to the type-level view of the code. pyrefly or ty could do that and would still be just as fast. my guess is that once they have the basic python type checker as close to 100% as they can, they will start looking at custom modules for various popular metaprogramming libraries, or add enough of a plugin framework that the community can contribute them.

source: spent several years working on a python type checker