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Q: 

Ruby: how can I get the name/version of the Yaml parser I'm using? Where can I get yaml4r?

I've been reading the YAML docs on http://yaml4r.sourceforge.net/doc/

There is an example:

puts [[ 'Crispin', 'Glover' ]].to_yaml( :Indent => 4, :UseHeader => true, :UseVersion => true )

It's supposed to emit a string with a "%YAML:1.0" tag in it---when I run it I don't get that at all.

Is there a way to tell which library I'm actually using? (I think I'm using the bundled Syck, but I don't know.) I Googled and saw there's a "yaml4r" but I don't see it as a Gem when I do a remote search.

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