The top comment quotes an implementor of a YAML parser, an implementor who in an addendum specifically calls out YAML 1.2 as STILL not being a superset of JSON:

The top comment quotes an implementor of a YAML parser, an implementor who in an addendum specifically calls out YAML 1.2 as STILL not being a superset of JSON: > Addendum/2009: the YAML 1.2 spec is still incompatible with JSON, even though the incompatibilities have been documented (and are known to Brian) for many years and the spec makes explicit claims that YAML is a superset of JSON. It would be so easy to fix, but apparently, bullying people and corrupting userdata is so much easier.