I never thought of using destructuring-bind together with quasiquoting in such a direct way. It does seem that that's a simpler way than what I have done. I'll have to think about it some more. Though we have to consider I had to write this in Ruby, where I don't have access to CL niceties. :)

It did get me thinking, though, so I appreciate the advice. I'm wondering now how to port that idea to Ruby.