Proposal: a more consistent and stricter number converting function - Number.of()

[T.J. Crowder]

>
> * If you know that your input is either a string or null/undefined (e.g.,
> as the result of  `someHTMLElement.getAttribute('foo')`), you could use
> `Number.parseFloat()`, which will produce NaN for the empty string, null
> and undefined.
>

Of course, `Number.parseFloat("23.4ducky")` results in `23.4`. Duan
indicated he/she wanted this `Number.of` to be more strict.

I, too, have wanted something *strict* that didn't convert `""` and `null`
to `0`. (Like many, I suspect, I have one in my toolkit; but the idea of
something in the standard library appeals.)

-- T.J.
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