But immutability makes it conceptually a hell of lot cleaner, and feasible to do even if you're investing orders of magnitude less in your GC than went into the

But immutability makes it conceptually a hell of lot cleaner, and feasible to do even if you're investing orders of magnitude less in your GC than went into the JVM. Which is important if Clojure gets ported to bare metal runtimes, as the parent was suggesting.