'error' event is not triggered on the socket on connection error

[vicneanschi]

I've upgraded from 0.9 and noticed that error event is not triggered on socket when client can't connect to the server.

  socket = io.connect(url, opts);
  socket.on('error', function (error) { 
    // never triggered on connection error
  }).on('connect_error', function(error){
    // this is triggered instead
  });

Documentation says:

Socket::error. Fired upon a connection error