[aiofiles] .name on NamedTempFile is always a str

[sobolevn]

Closes #13551

Basically, this is a wrapper around

typeshed/stdlib/tempfile.pyi

Line 219 in 28106bc

name: str

>>> from aiofiles.threadpool import stdin
>>> stdin
<aiofiles.threadpool.text.AsyncTextIndirectIOWrapper object at 0x105cb6d90> wrapping <_io.TextIOWrapper name='<stdin>' mode='r' encoding='utf-8'>
>>> stdin.name
'<stdin>'

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[srittau]

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:

typeshed/stdlib/typing.pyi

Lines 771 to 774 in 0b8dcfc

	# Usually str, but may be bytes if a bytes path was passed to open(). See #10737.
	# If PEP 696 becomes available, we may want to use a defaulted TypeVar here.
	@property
	def name(self) -> str | Any: ...

[sobolevn]

Great idea! Thanks a lot! ❤️

[sobolevn]

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 :(