Return type of zipfile.Path.open is not correct when using non-binary mode

[FeldrinH]

Example:

import zipfile

zip_path = zipfile.Path('example.zip', at='example.txt')
with zip_path.open(mode='r') as f:
    content = f.read()
    assert isinstance(content, str)

In this example the code functions as expected, and prints <class 'str'>, but the inferred type for f is IO[bytes] and the inferred type for content is consequently bytes, which is incorrect. The signature of zipfile.Path.open seems to assume a binary mode no matter what the mode argument actually is.

Python version: 3.10.11

PS: I am aware of #9966. I believe that that is a separate issue, because the issue there is about zipfile.Path.open arguments, whereas this issue is about the return value.

[srittau]

Thanks for the report. Our Path.open() signature was broken in several ways. I opened #10861 to fix it.