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

Because when we discussed those kind of approaches with TC39, they told us not to and to just use Array. It wasn't just about `[]`, it was also about `FileList`, `NodeList`, etc. And the problem with those was not that they did not have enough methods like Array, it was that they required a proxy.

And so then we investigated alternatives to current APIs and found out we could use Array and sequences (for input) just fine.

You could go back to TC39 I suppose and say you really want to do typed arrays again...

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