It's just historical. And Lisps being so powerful you can actually use the language itself to add type safety to it and there's no need for a lot of code (type

It's just historical. And Lisps being so powerful you can actually use the language itself to add type safety to it and there's no need for a lot of code (typed Clojure --although not perfect yet-- is quite small, for example). The great thing is that you also don't need to do it yourself because there are people working on the issue. With the Lisp "revival" and especially all the coders re-discovering Lisp nowadays I expect to see more and more research in that area and it's pretty exciting. We'll soon get Emacs (or IDEs) warning us in realtime about type errors ; )