title: Should I use type, if my "extends AnyVal" has not methods?
body: <p>The internet was not able to answer my question yet. Those two lines seem interchangeable to me: </p>
  
  <pre><code>type Meter = Double
  class Meter(val d: Double) extends AnyVal
  </code></pre>
  
  <p>If Meter does not have any methods, should I use <code>type</code> instead? What's the difference?</p>