Re: [heycam/webidl] Remove [LegacyArrayClass] (#291)

> Folks from TC39 have repeatedly asked us to stop designing APIs that require proxies.

Tho, it looks like using `iterable<>` automatically opts you into needing proxies, because you're required to support indexed properties for it, and that gives you the `a[0]` support.  Right?  So there's no way to make anything even *remotely* Array-like without making a Proxy in WebIDL?

> Is that true?

Yeah, bz points out that it's not, as I recognized in the later part of my response. ^_^

> Anyway, I don't see how [LegacyArrayClass] helps with this.

I mean, [LegacyArrayClass] is basically "subclassing Array".  All "subclass" means is that the superclass's prototype is in the subclass's prototype chain.  Am I drastically misunderstanding something here?

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