Hi everybody, checking if a value is a number is currently really complicated and I have stumbled upon a fair amount of code where this lead to bugs.
The easiest way is `typeof value === 'number'`. This however has the drawback that `NaN` also evaluates to true. Furthermore, basically every expression preceded by a `+` evaluates to true. … and there are even more gotchas. For a full roundup read https://github.com/jonschlinkert/is-number. This implementation could also be used as a starting point. (However, I would argue that `isNumber('3')` should evaluate to false. It's a string after all.) Therefore I think a `isNumber` functionality should already be provided natively. What do you think?
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