Re: [heycam/webidl] What does FrozenArray mean in dictionaries? (#900)

I noticed a new case of this in https://github.com/web-platform-tests/wpt/pull/28739 and dug up all the current cases of `FrozenArray<T>` dictionary members:
https://immersive-web.github.io/hit-test/#idl-index
https://immersive-web.github.io/webxr/#idl-index
https://w3c.github.io/orientation-sensor/#idl-index
https://wicg.github.io/shape-detection-api/#idl-index
https://wicg.github.io/shape-detection-api/text.html#idl-index
https://wicg.github.io/ua-client-hints/#idl-index

It looks like in most cases it was just copy-pasted from an interface. While one can make sense of what this means and create the frozen arrays, it does seem kind of pointless. Whenever a dictionary is returned it's a new object, is there really any point in making arrays within frozen?

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