Address feedback from @zhenyao

The MaxInt variable in the test has an confusing name for a couple of reasons:
1) The maximum integer that JS can safely handle is 2^53.
2) The maximum 32 bit integer is 2^32-1, not 2^32.

Renamed MaxInt variable to MaxInt32PlusOne.  The 32 clarifies we want the maximum 32 bit integer.
PlusOne indicates we want 2^32, which will trigger the overflow condition.