Re: [heycam/webidl] A new approach to array-ish classes (#796)

I think the next steps here are for me to write up a Web IDL pull request, plus some pull requests to other specs (e.g. CSS Typed OM, Constructible Style Sheets) that show this in action. I'll focus on "new" arraylikes now, i.e. ones with minimal compat concerns and no extra methods like `item()`. If we can get that working smoothly, then we can work on porting it back to trickier cases, which might require the `legacyarraylike<T>` type thing.

Any thoughts or concerns about those steps? E.g. a worry from folks that we should work on the legacy-retrofit-friendly thing at the same time as the new classes, since they might share a good amount of spec infra?

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