Re: [heycam/webidl] Figure-out what supporting Array-subclassing implies (#345)

I think the main problem here is that you are very interested in type-checked arrays, but ECMAScript doesn't provide them and nobody else seems motivated enough to solve this problem. Furthermore, even a normal subclassed array would not help you, as some of these interfaces already inherit.

The other differences is that you are interested in having type-checked intermediate values, whereas the rest of the platform mostly performs that checking when values get applied.

Though sometimes there are intermediate interfaces available, such as `Headers`, but you can pass its constructor values straight to `fetch()`, `Request`, and `Response` too. If `Headers` was a list it would have had a similar design problem as you face here. The advice I remember from TC39 is that even in that case, don't require a `Proxy` still applies, and until someone actually does the due diligence of working it through with them it's hard to support this.

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