Comment by forty

Yes absolutely, in practice the limit seems to be on the document size rather than on keys specifically. That said it still sets a limit on the key size (to something a bit less that the max full size), and some JSON documents valid for a given JSON implentation might not be parsable by others, in which case the Yaml parsers are no exceptions ;)

I'm not even sure why I'm playing the devil's advocate, I hate Yaml actually :D