`schema.core/validate` does not throw on `nil` values for sequence schema like `[s/Int]`

[cloojure]

• [x] This is a bug report (with instructions to reproduce) or other issue with the code

Sample code

(ns tst.demo.issue
  (:use tupelo.core tupelo.test)
  (:require
    [schema.core :as s]
    ))

(dotest
  (is= 5   (s/validate s/Int 5))
  (throws? (s/validate s/Int nil)).  ; s/validate throws on failure (nil value)

  (is= 5   (s/validate (s/maybe s/Int) 5))
  (is= nil (s/validate (s/maybe s/Int) nil))   ; s/maybe allows nil values to succedd

  (is= []  (s/validate [s/Int] []))
  (is= [5] (s/validate [s/Int] [5]))
  (is= nil (s/validate [s/Int] nil))   ; ***** does not throw for nil values, even w/o s/maybe! *****

  (is= []  (s/validate (s/maybe [s/Int]) []))
  (is= [5] (s/validate (s/maybe [s/Int]) [5]))
  (is= nil (s/validate (s/maybe [s/Int]) nil))   ; behaves as expected
  )

In the 3rd block of tests, s/validate should throw for the value nil and the schema [s/Int]

The above demo code was build using my favorite template project:

• https://github.com/io-tupelo/clj-template

[w01fe]

Hi, I believe this is by design, nil is an empty sequence in Clojure (in addition to being null and "falsey")