See YAML::Any, its just old-api way (inspired by Data::Dumper) of specifying formatting options ...

some never worked, I doubt any of the options works anymore

its a copy paste from 2009 when ysh disappeared from YAML, and I was seeing what I can see about YAML

Actually its from 2011 when I took another look at YAML to see if I can roundtrip yaml without changing format; I even went to IRC to ask ingy about it and the answer was no

Human writable/readable serialization format, great idea
Uh oh, full spec is so full, its full of full
Oh boy :) Java is the only language that fully supports the full spec
Poor humans :) None or very weak editor support
Damn computers :) No round tripping (what goes out looks nothing like what goes in)
Awww :) No customizable beautifier ( no Perl::Tidy )

So great idea, fantastic even, gets upgraded, support never that great, humans not that interested , humans choose JSON, JSON wins

Maybe when YAML tools improve ten fold, brave folks will look at YAML again, but most will still stick with JSON :)