title: Best way to find the intersection of multiple sets?
body: <p>I have a list of sets:</p>
  
  <pre><code>setlist = [s1,s2,s3...]
  </code></pre>
  
  <p>I want s1 ∩ s2 ∩ s3 ...</p>
  
  <p>I can write a function to do it by performing a series of pairwise <code>s1.intersection(s2)</code>, etc.</p>
  
  <p>Is there a recommended, better, or built-in way?</p>