[Python-Dev] Returning -1 from function with unsigned long type

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I'm fiddling with the "compile Python w/ C++" stuff and came across a number
of places where a function is defined as returning unsigned long or unsigned
long long but returns -1.  For example, see PyInt_AsUnsignedLongMask.
What's the correct fix for that, return ~0 (assuming twos-complement
arithmetic), cast -1 to unsigned long?  Or does the API need to be changed
somehow?

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