Re: [heycam/webidl] Can we use ObjectCreate in object creation? + other editorial tweaks (#655)

I _think_ the reason that the ES spec says:
`Let _A_ be a newly created Array exotic object.`
rather than:
`Let _A_ be ObjectCreate(...).`
is that the latter form doesn't give you anything explicit that says "this is an Array exotic object", which you need, for example, when an algorithm step says:
`If _argument_ is an Array exotic object, ...`

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