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

> That would presumable be a ReactToAbleArray, not a ReadonlyArray. But yes, that would be the idea.

Actually TypedOM needs ReadonlyArray for that case specifically; numeric operations form a tree (or actually a graph if you're doing weird stuff with reusing values) and typechecking (in the CSS type sense, not the JS/IDL type sense) is both strict and kinda expensive.

But yes, the other places where I'm doing arraylikes by hand (CSSTransformValue and CSSUnparsedValue) are Observable.

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The reason I was asking about NumericArray first, tho, is that those other two cases actually are quite different - they're CSSStyleValue subclasses.  Is that sort of thing going to be supported? Or must these arraylikes definitely be subclasses of ReadonlyArray/ObservableArray?

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