Re: [whatwg/webidl] Make ObservableArray "subclassable" (Issue #1342)

Hm, that said, we've (purposely, I believe) moved away from ObservableArrays being constructable objects; instead they're just JS arrays with a proxy wrapped around them. Preserving that quality might be worthwhile, in which case a more focused syntax that just specifies extra operations on the proxy might be better? Like:

```
ObservableArray<CSSRule> CSSRuleList {
  CSSRule? item(int index);
};
```

Then you could use `CSSRuleList` as a type and it's just an ObservableArray with an extra method implemented in the proxy.

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