I did and it's one of my favorite implementations actually!
Unfortunately I get this weird vibe with many Common Lisp libraries that they feel... legacy and deprecated. For sure CL isn't super popular language and it is very stable, but minimal development dynamic makes me feel insecure about the solution.
It sounds similar to Clojure libs. It might be an Illusion. Maybe those libs are done, zero to minimal need for further development! Our perception is shaped by regular bugfixes in other languages
> If f and g are in the same file, where g calls f, then implementations are not required to allow f and go to be separately redefinable. So that is to say, if f is redefined only, the existing g may keep calling the old f. The intent is that redefinition has the granularity of compiled files: if a new version of the entire compiled file is loaded, then f and g get redefined together and all is cool.