node.js 0.6.x garbage collector fail

client.js

var WebSocket = require('ws')

// open 200 connections that close after 5 seconds
for (var i = 0; i < 200; i++) { openWs() }

function openWs() {
  var ws = new WebSocket('ws://localhost:8080')
  ws.on('open', function() {
    ws.send('hello')
    setTimeout(function() { ws.close(); }, 5000)
  });
}

output.txt

connected: 0, not garbage collected: 0
connected: 0, not garbage collected: 0
connected: 80, not garbage collected: 80        <-- "node client.js" is started
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 125, not garbage collected: 132
connected: 0, not garbage collected: 7
connected: 0, not garbage collected: 7
connected: 0, not garbage collected: 7
connected: 200, not garbage collected: 207      <-- "node client.js" is started
connected: 200, not garbage collected: 207
connected: 200, not garbage collected: 207
connected: 200, not garbage collected: 207
connected: 200, not garbage collected: 207
connected: 0, not garbage collected: 26
connected: 0, not garbage collected: 26
connected: 0, not garbage collected: 26
connected: 0, not garbage collected: 26
connected: 0, not garbage collected: 26
connected: 200, not garbage collected: 226      <-- "node client.js" is started
connected: 200, not garbage collected: 226
connected: 200, not garbage collected: 226
connected: 200, not garbage collected: 226
connected: 200, not garbage collected: 226
connected: 0, not garbage collected: 30
connected: 0, not garbage collected: 30
connected: 0, not garbage collected: 30
connected: 0, not garbage collected: 30
connected: 0, not garbage collected: 30
connected: 0, not garbage collected: 30
...

(the 30 sockets are never gc'ed, even after some minutes)

server.js

// npm install weak ws
// run with "node --expose_gc server.js"

var weak = require('weak')
  , httpServer = require('http').createServer()
  , WebSocketServer = require('ws').Server

var count = 0
  , countGc = 0
  , wss = new WebSocketServer({ server: httpServer })

setInterval(function() {
  if (typeof gc === 'function') gc()
  console.log('connected: %d, not garbage collected: %d', count, countGc)
}, 1000)

wss.on('connection', function(ws) {
  ws.send('hello')

  // count client objects not garbage collected
  countGc++
  weak(ws, function() { countGc-- })
  
  // count connected clients
  count++
  ws.on('close', function() { count-- })
})

httpServer.listen(8080)

version 0.10.4
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 199, not garbage collected: 200
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
-> stop client -> run again
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 0, not garbage collected: 0
connected: 0, not garbage collected: 0
connected: 0, not garbage collected: 0
connected: 0, not garbage collected: 0
connected: 0, not garbage collected: 0