In Clojure map also works on hashes and sets. In keeping with the previous discussion, there's also only one variety of map in Clojure. It's this orthogonality of operations and datatypes that I think is Clojure going in the right direction.

None of which is to say that Clojure isn't standing on the shoulders of giants.

You might be interested in the FSet library (among others): https://common-lisp.net/project/fset/Site/index.html

Very well said. The advent of transducers in Clojure has made this 'orthogonality' especially true.

...And us schemers have the TinyCLOS derivatives, so our map could work on any DS: by default, however, it doesn't :-(.