title: Django: '<' not supported between instances of 'User' and 'User'
body: <p>When I do:</p>
  <pre><code>    qs1 = User.objects.filter(first_name__icontains=search).filter(is_superuser=False)
      qs2 = User.objects.filter(last_name__icontains=search).filter(is_superuser=False)
      users = sorted(set(chain(qs1, qs2)))
  </code></pre>
  <p>I get this error:</p>
  <pre><code>'&lt;' not supported between instances of 'User' and 'User'
  </code></pre>