title: Overriding a sealed trait in Scala
body: <p>I am using a library that has a sealed trait.
  I really need to extend this trait. </p>
  
  <p>Is there a way (even a dirty one) to bypass that?</p>
  
  <p>For a bit of background, this is what I am trying to work around : <a href="https://github.com/ReactiveMongo/ReactiveMongo/issues/247" rel="nofollow">https://github.com/ReactiveMongo/ReactiveMongo/issues/247</a></p>