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

This is the only mutable `FrozenArray<T>` attribute in Blink, and perhaps the first in any spec, so I thought it best to check if behavior like this is fine:
```
artwork = [];
metadata.artwork = artwork;
assert_not_equals(metadata.artwork, artwork)
assert_equals(metadata.artwork, metadata.artwork)
```

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