> I.e., why isn't this a ruby command instead of sed?

That's the wonderful power of the wikis. You perceive this as a bug and 
with the Edit link at the bottom of the page, you have the power to 
change it! So I expect to see a new revision of that page edited by Bil 
Kleb shortly ;)

P.S.: Thanks for the good talks in Virginia. Let's work something out 
that can get your team out of the Cold Fusion dark and into the Ruby on 
Rails light ;)
--
David Heinemeier Hansson,
http://www.rubyonrails.org/  -- Web-application framework for Ruby
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http://www.loudthinking.com/ -- Broadcasting Brain
http://www.nextangle.com/    -- Development & Consulting Services