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Neil,
your mod to PyArg_Parse is far too aggressive. Apparently the integer formats have accepted floating point arguments since day one, and all weekend I'm running across places where floats are passed to integers. For example, the MacPython IDE does this all the time, and I wouldn't be surprised if there's lots of windowing code that does this (compute pixel positions in floating point and then passing them to something expecting an integer).

If this is fixed in this way (disallowing floats where integers are expected) it should at least be done with a DeprecationWarning for one release cycle. I think the fix probably is a good idea in the long run, but it will break large bodies of code...