I also rarely use multi-methods in Clojure. I just use maps and vectors and lists and keywords and strings and functions. Instead of multi-methods, I generally

I also rarely use multi-methods in Clojure. I just use maps and vectors and lists and keywords and strings and functions. Instead of multi-methods, I generally use a map of fns. When not writing open, extendable libraries, this is an even simpler choice which I find works well. Most of my Clojure work has been writing applications, so being able to extend in an open way is not a benefit. I'd prefer to keep everything centralized in one map. Also, as I described above in the blog post, protocols/interfaces aren't needed to implement Clojure's object model either. They're just one approach. They're the nominal typing approach, in contrast with something like the structural typing approach, documented in the blog post. For that, we use C++20 concepts for structural typing predicates.