[mediacapture-main] Is there any sense in having defaults for SupportedCapabilities?

alvestrand has just created a new issue for 
https://github.com/w3c/mediacapture-main:

== Is there any sense in having defaults for SupportedCapabilities? ==
http://w3c.github.io/mediacapture-main/getusermedia.html#media-track-supported-constraints
 says that MediaTrackSupportedCapabilities has default value of "true"
 for everything.

This dictionary is only returned - it's never an argument to anything.
Does having defaults even make sense here?


Please view or discuss this issue at 
https://github.com/w3c/mediacapture-main/issues/293 using your GitHub 
account