I’ve always thought that CPS is a good barometer for finding out whether a developer is talented or whether they THINK they’re talented enough to design and/or implement these kinds of compiler components. This kind of thing but definitely CPS in particular is so much trickier to nail down than it initially seems if you’ve written a compiler before. Up there in difficulty with automatic parallelization and loop transforming. I tried to write a very small POC lisp once with an idea to have all vectors of known sizes get map’d in parallel and I never could nail it down.

Kudos to all involved. Clojure is such a mind bending tool. God only knows what it takes these people to maintain the guts of it all.