Is there an easy way to modify an existing s/keys spec? I often find myself needing to take an existing spec and update a few keys. It’d be nice if I could just replace a key instead of copying everything.

Maybe s/merge would work for you @xiongtx? I'm not quite sure how it handles merging over existing keys tho'

Is it possible to instrument initial function calls? i.e. I have my dev namespace where I enable instrumentation:

(ns dev.user
  (:require
    [clojure.spec.test.alpha :as st]
    [my-project.util]))

(st/instrument)

(ns my-project.util
  (:require
    [clojure.spec.alpha :as s]))

(defn reg-event
  [id]
  ;; do side effecting stuff
  nil)

(s/fdef reg-event
        :args (s/cat :id keyword?)
        :ret nil?)

(reg-event "my-event")