emitting to a room doesn't work for namespaced clients

Failing

io.of('/foo').on('connection', function(client) {
  client.join('aaa');
  this.in('aaa').emit('goes to noone since packet endpoint is set to "/foo/aaa", instead of "/foo" and room: "aaa"')
})

Working

io.of('').on('connection', function(client) {
  client.join('aaa');
  this.in('aaa').emit('goes to aaa members since packet endpoint is set to "aaa"')
})

[roymckenzie]

I figured it out. Basically, when emitting to namespaced rooms you also need to define the namespace.

io.of('/chat').in( 'cool room' ).emit( 'new message' );

[alirezanasseh]

Still not solved in 2018! socket.io 2.1.0, why?!