[BUG] Calling close on Server raises ConcurrentModificationError

[maperz]

Calling close on an instance of Server crashes with a ConcurrentModificationError when any clients are connected.

This happens due to removing sockets from the nsps["/"].sockets list while iterating over it.
As a quick fix for now I came up with following solution:

while (nsps['/'].sockets.length > 0)
{
   var socket = nsps['/'].sockets.first;
   socket.onclose();
}

Is this a know issue?