OptionalChangeWhat the user asked: to turn it on or off, or to switch to another device of its kind. Absent when the room can't
tell, as for a failure LiveKit reports on its own (its MediaDevicesError).
The microphone, the camera, the screen share, or the speaker (where the room's sound plays).
The device a
deviceerror is about, and what the user asked of it, so a UI can say so in its own words (the meeting room's notice does).