// Return value >= 0 is the index where the sequences differs.
// -1: reached the end of o1 without a difference
// -2: reached the end of both seqeunces without a difference
// -3: reached the end of o2 without a difference
private static int cmp(PyObject o1, int ol1, PyObject o2, int ol2) {
if (ol1 < 0) ol1 = o1.__len__();
if (ol2 < 0) ol2 = o2.__len__();
int i = 0;
for (; i < ol1 && i < ol2; i++) {
if (!o1.__getitem__(i)._eq(o2.__getitem__(i)).__nonzero__()) return i;
}
if (ol1 == ol2) return -2;
return (ol1 < ol2) ? -1 : -3;
}
