Add PyUnstable_Object_IsUniquelyReferenced #149
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Adds a shim for
PyUnstable_Object_IsUniquelyReferenced
and a test for the shim.I'd like to use this function in a few libraries but don't want to have to have a thread-unsafe check in 3.13 or add new uses of internal headers outside of the compat header here.
I'm not sure whether the using stuff from internal headers is ok in a shim like this. I'm also not sure if you want to avoid
PyUnstable
functions in the compat headers.The implementation is copy/pasted from the implementation of
_PyObject_IsUniquelyReferenced
.