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I mean, that's pretty much what I'd do if I wanted to know the exact value of a float. Tangentially, have you ever tried to detect whether a 0 is positive or negative in javascript? That one is also incredibly obnoxious.
It hadn't occurred to me that might work on +/- 0, but it does - provided you've got a modern browser. Sadly, much of the javascirpt I write is still in the subset supported by IE8.
`1/x === -Infinity` then
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