Instead of writing strong type checking code. I prefer to break function into pieces. Since Lisp has good trace function, you can easily see how functions compo

Instead of writing strong type checking code. I prefer to break function into pieces. Since Lisp has good trace function, you can easily see how functions composite with others during running time. For example, see my post: http://dryman.github.com/blog/2012/03/31/persistent-red-black-tree-in-lisp-3/ http://dryman.github.com/blog/2012/03/31/persistent-red-blac...