title: Why no immutable arrays in scala standard library?
body: <p>Scala has all sorts sorts of immutable sequences like List, Vector,etc. I have been surprised to find no implementation of immutable indexed sequence backed by a simple array (Vector seems way too complicated for my needs).</p>
  
  <ul>
  <li><p>Is there a design reason for this? I could not find a good explanation on the mailing list.</p></li>
  <li><p>Do you have a recommendation for an immutable indexed sequence that has close to the same performances as an array? I am considering scalaz's ImmutableArray, but it has some issues with scala trunk for example.</p></li>
  </ul>
  
  <p>Thank you</p>