title: First element in natural ordering from Scala Set
body: <p>I have Scala immutable <code>Set</code></p>
  
  <pre><code>Set("c", "b", "a")
  </code></pre>
  
  <p>I want to take first element in natural ordering from it.</p>
  
  <p>Code that works for me is </p>
  
  <pre><code>TreeSet(set.toList: _*).firstKey
  </code></pre>
  
  <p>It isn't very readable though. Is there any shorter/easier solution for it?</p>