Re: [w3c/permissions] Give the UA permission to return anything it wants from query(). (#97)

> +      state</a> with the same <a>current settings object</a> should return the
> +      same value, unless the UA receives new information about the user's
> +      intent.
> +    </p>
> +
> +    <p class="issue" id="issue-current-entry-incumbent-or-relevant">
> +      Safari is the only known UA that returns different results from this
> +      algorithm for different settings objects with the same origin. We should
> +      test which of the <a
> +      href="https://html.spec.whatwg.org/multipage/webappapis.html#realms-settings-objects-global-objects">several
> +      possible settings objects</a> it uses.
> +    </p>
> +
> +    <p>
> +      Some powerful features have more information associated with them than
> +      just a {{PermissionState}}. For example, {{MediaDevices/getUserMedia()}}

I actually expect that the "camera" permission descriptor will become more like [`MediaStreamConstraints`](https://w3c.github.io/mediacapture-main/#idl-def-MediaStreamConstraints), rather than just the device ID that's there now. The descriptor is about describing a desired permission, while the `extra permission data` is about describing a granted permission, and they can be totally different kinds of data.

I've updated the example above to make that more clear, by using `"bluetooth"` instead of `"camera"`.

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