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The spec says regarding MediaStream constructor: "If the argument is supplied, it MUST either be of type MediaStream or an array of MediaStreamTrack objects." I would avoid MUST here (since the conformance requirement is already enforced via the WebIDL definition in any case); I would simply state: "The constructor takes an optional argument of type MediaStream or an array of MediaStreamTrack objects."
was fixed in http://dev.w3.org/2011/webrtc/editor/archives/20130704/getusermedia.html