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

I like the extended attribute idea. Something like (not entirely sure about placement of extended attributes, forgive me):
```idl
[Cached] attribute [FrozenArray] sequence<Item> arr;
```
(With [Cached] from #212. And [FrozenArray] can only be used if [Cached] is used or if it's a method, and the type is a sequence.)

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