I don't think we can do this unconditionally. aiofiles.threadpool.open() will also return an AsyncTextIOWrapper, which might be a file descriptor:

import asyncio
from os import fdopen

from aiofiles import open as aioopen

async def main():
    f = open("bar.txt")
    async with aioopen(f.fileno()) as aiof:
        print(type(aiof.name))  # <class 'int'>

asyncio.run(main())

Maybe it's best if we make _UnknownAsyncTextIO and the two wrapper classes generic over name with a default of FileDescriptorOrPath. Then we can bind this to str in the return type of NamedTemporaryFile.

In fact, we could use this as a template for the stdlib, where we already have a comment alluding to this:

Great idea! Thanks a lot! ❤️

Now, when I double checked that, I think that I would prefer to close this PR, because it is too complex. Notice that def NamedTemporaryFile has multiple @overloads that return different subtypes of _UnknownAsyncBinaryIO, not even direct ones. I think that making all of the generic is an overkill :(