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4759ba6eec
This gets rid of the immortal check in `PyStackRef_FromPyObjectSteal()`. Overall, this improves performance about 2% in the free threading build. This also renames `PyStackRef_Is()` to `PyStackRef_IsExactly()` because the macro requires that the tag bits of the arguments match, which is only true in certain special cases.
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/