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GH-101291: Add warning to "what's new" that PyLongObject
internals have changed. (GH-107388)
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@ -1865,6 +1865,17 @@ Porting to Python 3.12
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subinterpreter that they don't support (or haven't yet been loaded in). See
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:gh:`104668` for more info.
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* :c:struct:`PyLongObject` has had its internals changed for better performance.
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Although the internals of :c:struct:`PyLongObject` are private, they are used
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by some extension modules.
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The internal fields should no longer be accessed directly, instead the API
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functions beginning ``PyLong_...`` should be used instead.
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Two new *unstable* API functions are provided for efficient access to the
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value of :c:struct:`PyLongObject`\s which fit into a single machine word:
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* :c:func:`PyUnstable_Long_IsCompact`
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* :c:func:`PyUnstable_Long_CompactValue`
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Deprecated
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----------
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