[heycam/webidl] Can FrozenArray<T> be used for a mutable attribute? (#265)

https://heycam.github.io/webidl/#idl-frozen-array
https://heycam.github.io/webidl/#es-frozen-array

file:///usr/local/google/home/foolip/spec/mediasession/index.html#the-mediametadata-interface has this:

```WebIDL
[Constructor(optional MediaMetadataInit init), Exposed=Window]
interface MediaMetadata {
  attribute DOMString title;
  attribute DOMString artist;
  attribute DOMString album;
  attribute FrozenArray<MediaImage> artwork;
};
```

Does that work? I can't see anything in Web IDL that explicitly disallows it, but also don't understand what would happen if assigning to artwork.

@xxyzzzq @mounirlamouri

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