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…pythonGH-148302)

Improve ABI/feature selection, add new header for it.

Add a test that Python headers themselves don't use
Py_GIL_DISABLED in abi3t: abi3 and abi3t ought to be the
same except the _Py_OPAQUE_PYOBJECT differences.
This is done using the GCC-only poison pragma.

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

…` on free-threading (python#148908)

…ython#148872)

… string representations of ForwardRef (python#148682)

Co-authored-by: Shamil <[email protected]>

…from both `ValueError` and `IndexError` (python#148664)

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

… Lines file (python#132632)

Co-authored-by: Brian Schubert <[email protected]>

pythongh-148886)

Avoid racing with the owning thread's refcount operations when
immortalizing an interned string: if we don't own it and its refcount
isn't merged, intern a copy we own instead. Use atomic stores in
_Py_SetImmortalUntracked so concurrent atomic reads are race-free.

Add '+' alternatives to signed_number and signed_real_number grammar
rules, mirroring how unary minus is already handled for pattern matching.
Unary plus is a no-op on numbers so the value is returned directly without
wrapping in a UnaryOp node.

…ntend (pythonGH-148089)

* Replaces ad-hoc logic for ending traces with a simple inequality: `fitness < exit_quality`
* Fitness starts high and is reduced for branches, backward edges, calls and trace length
* Exit quality reflect how good a spot that instruction is to end a trace. Closing a loop is very, specializable instructions are very low and the others in between.

Improve  `hash()` builtin docstring with caveats.

Mention its return type and that the value can be expected to change between
processes (hash randomization).

Why? The `hash` builtin gets reached for and used by a lot of people whether it
is the right tool or not. IDEs surface docstrings and people use pydoc and
`help(hash)`.

Fixes python#108951

Co-authored-by: sobolevn <[email protected]>
Co-authored-by: Andrew Svetlov <[email protected]>
Co-authored-by: Guido van Rossum <[email protected]>

…RING_EVENT_*` values from pythongh-146182 (pythongh-148955)

python#146182 left an unintended change in the `PY_MONITORING_*` macro values. This change reverts that part to avoid a user visible impact.

…rg in compiler (python#148974)

…cio REPL (python#140288)

…on#148948)

Also add a test demonstrating the need for the existing "is oldcls" check.

Co-authored-by: Bartosz Sławecki <[email protected]>