Re: [webidl] CheckIterable(V) is not defined in ECMAScript 2015 (#61)

CheckIterable got refactored into GetMethod with P === Symbol.iterator, I believe.

> My main question: are array-like objects supported (e.g., NodeLists, or Objects with a length and indexed properties), or must they only have a Symbol.iterator?

The latter, but node that `NodeList` has a `Symbol.iterator`.

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