title: Type parameter in a method of a Haxe interface
body: <p>I try to create an interface, which has a generic map method, like:</p>
  
  <pre><code>interface Observable&lt;U&gt; {
      function map&lt;V&gt;(f:U-&gt;V):Observable&lt;V&gt;;
  }
  </code></pre>
  
  <p>which gives this error:</p>
  
  <pre><code>Class not found : V
  </code></pre>
  
  <p>is there any way to do this without change <code>V</code> to <code>Dynamic</code>?</p>