[didibus]

Maybe pre/post was added later?

They're now in the process of speccing all of core. Hopefully next release will have it.

I do think slow by default is part of it. I've seen a lot of builds deployed to prod without prod optimizations in my experience. That's why I think spec in not instrumented by default. Too worried people will keep it on at all times, and then Clojure would get a bad rep for being slow.