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Still gives wrong answer for $4000000000000000*3 == $4000000000000000*3.0 (where former overflows to negative, but latter stays positive), but should fix
db equal($5555555555555555, $5555555555555555+1)
db equal($5555555555555555, $5555555555555555+1+511.0)
to not return 00 01, at least