title: What do these numbers mean in socket.io payload?
body: <p>When I am using native websocket API I can see just a payload in my chrome console for sockts:
  <img src="https://i.stack.imgur.com/mZPKf.png" alt="enter image description here"></p>
  
  <p>But when I use socket.io with their emit event, I can see some strange numbers before my actual payload. I do understand that colors mean that you either send or received the data, but what does the numbers like <code>42, 3, 2, 430, 420, 5</code> mean.</p>
  
  <p>Is there a place I can get a full list of these numbers with descriptions?</p>
  
  <p><img src="https://i.stack.imgur.com/02YR2.png" alt="enter image description here"></p>
  
  <p>The code which generates it is kind of big, so I just post small snippets.</p>
  
  <p>Client side always look like this:</p>
  
  <p><code>socket.emit('joinC', room, function(color){ ... });</code></p>
  
  <p>Server side looks like this:</p>
  
  <p><code>io.sockets.in(room).emit('moveS', {...});</code></p>