Re: [heycam/webidl] non-readonly [FrozenArray] attributes are footguns as currently specced (#810)

Would [FrozenArray] and [Cached] extend to this?
```
callback MyCallback =
  void ( [Cached] [FrozenArray] sequence< [FrozenArray] sequence<Item> > parameter )
```

The desired behavior of [Cached] here is that the same ECMAScript Array is produced on sequence-to-ES conversion when the same sequence is passed for `parameter`, to avoid a copy each time.

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