`is` vs `explain` with expound

repl

> brew install clojure
> clj -Sdeps '{:deps {friendly {:git/url "https://gist.github.com/bhb/2686b023d074ac052dbc21f12f324f18" :sha "cbc5b3c73d4788a25570f125e5f2de23a3d2bf5f"}}}' -m friendly
user=> (require '[expound.alpha :as expound])
user=> (require '[clojure.test :refer [is]])
nil
user=> (require '[clojure.spec.alpha :as s])
nil
user=> (is (let [xs ["a" "b" :c "d"]]
  #_=>       (is (and (vector? xs)
  #_=>                (every? string? xs)))))

FAIL in () (NO_SOURCE_FILE:2)
expected: (and (vector? xs) (every? string? xs))
  actual: false
user=> (require '[clojure.spec.alpha :as s])
nil
user=> (s/explain (s/coll-of string?) ["a" "b" :c "d"])
nil
-- Spec failed --------------------

  ["a" "b" :c "d"]
           ^^

should satisfy

  string?



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Detected 1 error