Is it ok to use async __new__?

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Thanks for the comment. Although weird, it does allow one to create specialized versions of “functions” that have fewer generics. I think this is not possible today without classes.

import asyncio


class my_generic_function[A, B]:
    async def __new__(cls, a: A, b: B) -> tuple[A, B]:
        return a,b

class my_specialized_function[B](my_generic_function[str, B]): ...

async def main():
    await my_specialized_function('hello', 1) # OK
    await my_specialized_function(1, 1) # Type checker error

if __name__ == "__main__":
    out = asyncio.run(main())

The async aspect is really irrelevant in this example, but it is good this trick also works for async functions.

PEP 718: subscriptable functions