Feature Request: Metadata block in CommonMark?

[chrisalley]

Refer to discussion here:

Metadata in documents

It would be good to have a list of YAML capabilities to support natively. I can see binary data being useful in certain context. Well, if you can get a list of core features that needs to be kept, then that can be a start (And maybe we can forward that to either YAML or diet-YAML team. A good yardstick could perhaps be if it can convert from/to json/json5 at the least (if I remember json is not very large of a specification). Alternative proposed name for this stripped down YAML: cYAML - Co…