Hmm, it sounds like that's what you had before waterhouse's input. :-p
:) I think I still have that behavior. All I did was to fix coerce and 'nil. You can defgeneric without the acons check and defmethod on nil (or vice versa). It feels more 'pure', but I don't have any examples where it's a big win. It's _truly_ a win that you can simply replace def with defgeneric and get a superset of behavior without losing compatibility.
