Actually this is possible. (see http://xkcd.com/386/)
See the macro add-arity which I've put up here: http://gist.github.com/273349 This allows you to do things like: user> (add-arity keyword [ns name suffix] (keyword ns (str name "-" suffix))) #<user$eval__6304$fn__6309 user$eval__6304$fn__6...@5d8e63> user> (keyword nil "hello" "more") :hello-more The code I put up will handle (I think) all sorts of variations of arg counts: you can use add-arity just like defn and it will grab any specified arglists (including arglists with &) and proxy the others back to the original function. It doesn't do anything with metadata, though. Also, you can override a given arity on the original function, but you can't then call the original version at that arity. Whether this is a good idea or not is a completely different question :-) Tom
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