So libyaml still doesn't support 1.2?  I agree that the benefits of 1.2 are minimal and largely unimportant, but that's still discouraging.  The one thing I'm worried about--which I think we'll have to address at some point--is that while I still feel like YAML is a good choice, if we standardize around it we'll wind up having to take some responsibility for it as well.  There is an active YAML community and a number of people using it, but the core developers of the project seem to have limited time to work on it.  It's discouraging that the main C library for YAML isn't even up to date with the latest version of the standard which is almost 5 years old.