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In the free threading build, the per thread reference counting uses a unique id for some objects to index into the local reference count table. Use 0 instead of -1 to indicate that the id is not assigned. This avoids bugs where zero-initialized heap type objects look like they have a unique id assigned.
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/