This series on numerics is both useful and entertaining! Believe it or not, JS has +/- 0. http://www.2ality.com/2012/03/signedzero.html It may seem weird but it does come up in some cases.
A possibly more important part of the series is just what IS an integer in JS. Most of us consider it a 32 bit integer but that's not the case: http://www.2ality.com/2013/10/safe-integers.html -- Owen
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