Why doesn't Array.from() pass the array to the mapFn?

[T.J. Crowder]

On Wed, May 3, 2017 at 7:35 PM, Jordan Harband <ljharb at gmail.com> wrote:

> (an index in Array.from wouldn't make sense, because Array.from takes an
> iterable *or* an arraylike - and only an arraylike would be guaranteed to
> have an index, or even a "list" at all)
>

And yet, [it provides one](https://tc39.github.io/ecma262/#sec-array.from).
It's the index that will be used to set the array entry from the result.
It's only the third argument (the source object) that `Array.from` doesn't
include.

-- T.J. Crowder
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