I usually start a programming task CLOS by taking advantage of its flexibility,expressiveness and runtime dynamics. Then when I've got a better grasp of the str

I usually start a programming task CLOS by taking advantage of its flexibility,expressiveness and runtime dynamics. Then when I've got a better grasp of the structure of the task, I start to restrict that flexibility by using inlined generics and the like to get more speed. Much in the same way as I program Lisp in general, first getting the shape of the task and then honing it by adding type declarations gradually.