title: How do I find the min() or max() of two Option[Int]
body: <p>How would you find <code>minValue</code> below?
  I have my own solution but want to see how others would do it.</p>
  
  <pre><code>val i1: Option[Int] = ...
  val i2: Option[Int] = ...
  val defaultValue: Int = ...
  val minValue = ?
  </code></pre>