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No two conversion function in longobject.c seem to have the same rules for what to do about non-long objects :-(  I'm afraid some clean-up would be useful, but also difficult for fear of breaking existing user C code :-(

In fact, your patch doesn't apply with today's CVS because someone already tried to add some magic in PyObject_AsLongLong().  It also fails on test_array.py and applies uncleanly on arraymodule.c.

Also, it needs to update the array module documentation.