title: io.sockets.clients() gives error "Converting circular structure to JSON"
body: <p>I am trying to pass the contents of io.sockets.clients() through to the client with the following code:</p>
  
  <pre><code>var room_users = io.sockets.clients(newroom);
  socket.emit('update_room_users', room_users);
  </code></pre>
  
  <p>(newroom is a string var)</p>
  
  <p>But I get the error:</p>
  
  <blockquote>
    <p>Converting circular structure to JSON</p>
  </blockquote>
  
  <p>in the console.</p>
  
  <p>I have no idea why this is happening as this should be the correct code according the the socket.io site?</p>