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

> Eliminating FrozenArray would syntactically allow `sequence<>` in attributes,

For what it's worth, Gecko's parser allows `sequence<>` in attributes _only_ if `[Cached]` is used.  There's no problem with non-frozen sequence-typed attributes per se; there's a problem with non-cached ones, since you'd get a new value on each get...

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