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`Py_DECREF` and `PyStackRef_CLOSE` are now implemented as macros in the free-threaded build in ceval.c. There are two motivations; * MSVC has problems inlining functions in ceval.c in the PGO build. * We will want to mark escaping calls in order to spill the stack pointer in ceval.c and we will want to do this around `_Py_Dealloc` (or `_Py_MergeZeroLocalRefcount` or `_Py_DecRefShared`), not around the entire `Py_DECREF` or `PyStackRef_CLOSE` call.
The Python C API ================ The C API is divided into these sections: 1. ``Include/``: Limited API 2. ``Include/cpython/``: CPython implementation details 3. ``Include/cpython/``, names with the ``PyUnstable_`` prefix: API that can change between minor releases 4. ``Include/internal/``, and any name with ``_`` prefix: The internal API Information on changing the C API is available `in the developer guide`_ .. _in the developer guide: https://devguide.python.org/c-api/