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- I'm not sure whether PyObject_CallObject() is the right
idiom here. I would have expected to call cls->tp_new (if
not NULL), but I'm not sure either way.
- I would get rid of the loop counter: you're not using it.
for (;;) will do nicely
- you're XDECREF'ing values of which you know they're not NULL
- idem XINCREF. Also: I'm pretty sure you should incref d at
the end: I think it currently leaks.