avoid numpy sum where we are at risk of overflow #390
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check for overflow in get_bounds
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Numpy is not able to upcast int32 to int64 when overflowing
numpy does not give a warning when overflowing
numpy sum is only faster on numpy arrays not on python lists
change our bound calculations so we don't use numpy arrays, therefor the only things that will still overflow will be things that actually exceed python int bounds
check for overflow