Kristján Valur Jónsson added the comment:
These are very unusual semantics.
The convention in the python api is that functions are refernece-invariant when
there are errors. i.e. if a function fails or not does not change the caller's
reference passing assumptions.
For example, Py_BuildValue("N", myobject);
takes care to always steal the reference of myobject, even when Py_BuildValue
fails.
Thi tehe case of _PyBytes_Resize(), the caller owns the (single) reference to
the operand, and owns the reference to it (or a new one) on success. It is
highly unusual that the case of failure causes it to no longer own this
reference.
Python 3 should have taken the opportunity to remove remove this unusual
inheritance from _PyString_Resize()
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nosy: +kristjan.jonsson
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