title: Fish alias pass multiple arguments, access specific argument
body: <p>I would like to create an alias in script for creating <code>pull-requests</code> using <code>hub</code>.</p>
  
  <p>I'm planning on creating a function like this.</p>
  
  <pre><code># PR 
  function pr --description 'hub pr'
      hub pull-request -b $argv[0] -m $argv[1];
  end
  </code></pre>
  
  <p>The <code>-m</code> part can be optional though.</p>
  
  <p>So I can all it like this <code>pr 'branch here' 'message here'</code></p>
  
  <p>But I get an error saying <code>Array index out of bounds</code>.</p>