User Media Hints

We seem to have lost hints in the getusermedia specification. Was the 
ability for a developer to provide a hint for a particular camera (the 
'user' or 'environment' camera) removed for a reason? In the 
string-based options proposal we had the following:

e.g. navigator.getUserMedia('video;view=environment', gotMedia);

Do we have a similar proposal in the object options model? I've included 
3 models below that we could adopt and I'd be interested if anyone has a 
preferred model at this point that we can agree to implement:

navigator.getUserMedia({"audio": true, "video": "environment"}, gotMedia);

navigator.getUserMedia({"audio": true, "video": {type: "environment"}}, 
gotMedia);

navigator.getUserMedia({"audio": true, "video": "environment", "type": 
"environment"}, gotMedia);


br/ Rich