…inter is about to overflow the stack. (GH-141711)

Only raises if the stack pointer is both below the limit *and* above the stack base.
This prevents false positives for user-space threads, as the stack pointer will be outside those bounds
if the stack has been swapped.

Co-authored-by: Stan Ulbrych <[email protected]>

…GH-140904)

…41719)

With `-bb`, this failed on BytesWarning: str() on a bytes instance

…ted (#141716)

In Fedora, we've been given a slightly incomplete reproducer for a problematic
Python 3.14 color-related change in argparse that leads to an exception when
Python is used from mod_wsgi: https://bugzilla.redhat.com/2414940

mod_wsgi replaces sys.stdout with a custom object that raises OSError on .fileno():

https://github.com/GrahamDumpleton/mod_wsgi/blob/8460dbfcd5c7108892b3cde9fab7cbc1caa27886/src/server/wsgi_logger.c#L434-L440

This should be supported, as the documentation of fileno explicitly says:

> An OSError is raised if the IO object does not use a file descriptor.

https://docs.python.org/3.14/library/io.html#io.IOBase.fileno

The previously expected exception inherits from OSError,
so it is still expected.

Fixes #141570

Co-authored-by: Cody Maloney <[email protected]>
Co-authored-by: Victor Stinner <[email protected]>

…HOWTO (#138073)

* - Small clarifications and phrasing improvements

* nit

* Apply suggestions from code review

Co-authored-by: Peter Bierma <[email protected]>

* clarify event loops when multi threading.

* nit

* Update Doc/howto/a-conceptual-overview-of-asyncio.rst

Co-authored-by: Peter Bierma <[email protected]>

* nit

* nit

* phrasing for threads & event loops.

* revert changes to event-loop/thread discussion.

* sentence case consistencty.

* slight re-arrange.

* Sentence case consistency.

* tweak language. non-negligible

---------

Co-authored-by: Peter Bierma <[email protected]>