title: JQ: setdiff of two arrays
body: <p>If I have an object with two arrays containing unique values in it</p>
  
  <pre><code>{"all":["A","B","C","ABC"],"some":["B","C"]}
  </code></pre>
  
  <p>How can I find <code>.all - .some</code>?</p>
  
  <p>In this case I am looking for <code>["A","ABC"]</code></p>