Name already in use

- Remove first link to lexical definition of integer literal, since it
  doesn't apply (differs in handling of leading zeros, base needs to be
  explicitly specified, unicode digits are allowed)
- Better describe handling of leading zeros, unicode digits, underscores
- Base 0 does not work exactly as like a code literal, since it allows
  Unicode digits. Link code literal to lexical definition of integer
  literal.

…0630)

The PEP-249 numeric style has never been supported by sqlite3.

)

Fix the error message for disallowed `__weakref__` slots.

Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>

Update native_thread_id after fork

All the arguments are positional-only.

The current status after #99476 seems to be to not use positional-only
markers in documentation, hence I've simply removed it.

import dataclass not dataclasses from dataclasses

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>

…ule (#24961)

Co-authored-by: Stanley <46876382+slateny@users.noreply.github.com>

Not comprehensive, best effort warning. There are cases when threads exist on some platforms that this code cannot detect. macOS when API permissions allow and Linux with a readable /proc procfs present are the currently supported cases where a warning should show up reliably.

Starting with a DeprecationWarning for now, it is less disruptive than something like RuntimeWarning and most likely to only be seen in people's CI tests - a good place to start with this messaging.

)

As far as I can tell, this hasn't been actually used since Mac OS X 10.2.

…nes` (#100601)

…file pointers open (GH-100586)

* gh-100585: Fixed open fp bug in the imporlib module

* Added news for gh-100585

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>
Co-authored-by: Stanley <46876382+slateny@users.noreply.github.com>

It was an ancient, modified copy of libffi that has not been in use
since GH-22855.

…00544)

It has had no effect on non-macOS platforms for a long time, and has had
the non-obvious effect of invoking `pkg_config` and not setting
`-DUSING_APPLE_OS_LIBFFI` on macOS since GH-22855.

The define was only used to protect a `#pragma clang diagnostic`
setting, which is already better guarded by `__clang__` anwyay.

…100579)

Remove skipped test.

See discussion on #25326.
Fix is apparently here, but no-one is confident to review and land: #25347.