title: return single instance object as IEnumerable
body: <p>I have in instance of class foo and i want to return it as IEnumerable.
  Can i do it without creating a new list etc..</p>
  
  <p>Perhaps something like the following:</p>
  
  <pre><code>IEnumerable&lt;foo&gt;.fromInstance(foo)
  </code></pre>