Antoine Pitrou added the comment:

Py_INCREF usable as an rvalue sounds more like an accident than a deliberate 
feature, and it would be IMO counter-productive to codify this behaviour in the 
docs.

As for the lvalue usage of Py_REFCNT and Py_SIZE, I think it would be better if 
it were limited to CPython core. But arguably writers of extension types may 
want to mutate the size field of a varsize object.

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nosy: +pitrou

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<http://bugs.python.org/issue17589>
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