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gh-156995: Add caution around API behavior change #157292

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gh-156995: Add caution around API behavior change
cmaloney Sep 11, 2026
4cab087
Drop non-descriptive setence
cmaloney Sep 12, 2026
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6 changes: 6 additions & 0 deletions Doc/c-api/object.rst
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Expand Up @@ -808,6 +808,12 @@ Object Protocol
that this function doesn't call into the Python interpreter. This function
cannot fail.

.. caution::

For objects where :c:expr:`Py_REFCNT(op) == 1` is always true this
function will return false when checked in a different thread than the
allocation.

.. versionadded:: 3.14

.. c:function:: int PyUnstable_SetImmortal(PyObject *op)
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