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[3.12] GH-101291: Add warning to "what's new" that PyLongObject internals have changed. (GH-107388) (#107392)

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(cherry picked from commit 1ee605c588)

Co-authored-by: Mark Shannon <mark@hotpy.org>
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Miss Islington (bot) 2023-07-31 10:16:00 -07:00 committed by GitHub
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@ -1867,6 +1867,17 @@ Porting to Python 3.12
subinterpreter that they don't support (or haven't yet been loaded in). See
:gh:`104668` for more info.
* :c:struct:`PyLongObject` has had its internals changed for better performance.
Although the internals of :c:struct:`PyLongObject` are private, they are used
by some extension modules.
The internal fields should no longer be accessed directly, instead the API
functions beginning ``PyLong_...`` should be used instead.
Two new *unstable* API functions are provided for efficient access to the
value of :c:struct:`PyLongObject`\s which fit into a single machine word:
* :c:func:`PyUnstable_Long_IsCompact`
* :c:func:`PyUnstable_Long_CompactValue`
Deprecated
----------