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A comment on NaN does not equal NaN. Parent comment

Re:NaN does not equal NaN by masklinn on Tuesday September 27, 2011 @04:52PM (#3045185)
> For the record, isNaN in JavaScript is also not necessarily the fastest way of doing it

Which will absolutely not matter in 100% of the cases after rounding. `isNaN` is simple (your original criteria) and clearly says what it's doing.

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