is_file no longer throws an exception on Python 3.14

[intentionally-left-nil]

Bug report

Bug description:

Hello, when faced with a file in a folder the user cannot read, there is a behavior change between python 3.13 and 3.14. In the script below, you can see that is_file() returns different results:

import sys
import tempfile
from pathlib import Path


print(f"Python {sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}")
with tempfile.TemporaryDirectory() as tmp:
    root = Path(tmp)
    child = root / "child"
    child.mkdir()
    path_under_child = child / "nonexistent"
    try:
        child.chmod(0o000)
        try:
            result = path_under_child.is_file()
            print(f"  (child/nonexistent).is_file() = {result}  (no exception)")
        except OSError as e:
            print(f"  (child/nonexistent).is_file() raised: {type(e).__name__}: {e}")
        finally:
            child.chmod(0o755)
    except OSError as e:
        print(f"  chmod failed: {e}")
print("Done")

Here are the results:

Python 3.13.11
  (child/nonexistent).is_file() raised: PermissionError: [Errno 13] Permission denied: '/tmp/tmpc2x6rhs9/child/nonexistent'
Done

and for 3.14:

Python 3.14.2
  (child/nonexistent).is_file() = False  (no exception)
Done

Is this an expected change? If so, it's not mentioned in the What's New section: https://docs.python.org/3/whatsnew/3.14.html#pathlib

or is it an unexpected breaking change? It's not the end of the world, but it means adding more logic to work for both codepaths

CPython versions tested on:

3.14

Operating systems tested on:

Linux

[picnixz]

cc @barneygale

[pochmann3]

"What's new" doesn't mention every change. See its first paragraph. You can find gh-101357 mentioned in the changelog. And Querying file type and status (where is_file is documented) mentions the change.