title: what is the equivalent of boolean? in Clojure
body: <p>Scheme supports <code>boolean?</code> to test whether a symbol or value is of boolean type.</p>
  
  <pre><code>(boolean? #\t)
  (boolean? #\f)
  </code></pre>
  
  <p>While in Clojure, I can only found <code>integer?</code>, <code>number?</code>, <code>list?</code>, etc but without <code>boolean?</code>.</p>
  
  <p>What is the equivalent of <code>boolean?</code> in Clojure?</p>