Possible memory leak in node-proxy

proxy_memleak.js

// Run with:
//    node --trace-gc proxy_memleak.js 

var Proxy = require("node-proxy"),
    fs = require('fs'),
    util = require("util") ; 


var count = 100000 ;

var handlerFactory = function () {
  // Load something big:
  var data = fs.readFileSync("/bin/ls") ;
  
  return {
    get: function (receiver, name) {
      if (name === "length") {
        return data.length ;
      }
    },
    getOwnPropertyDescriptor: function(name) {
      var desc = undefined ;
      if (name === "length") {
        return Object.getOwnPropertyDescriptor(data, name) ;
      }
      return desc;
    },
    getOwnPropertyNames: function() {
      return ["length"] ;
    },
    defineProperty: function(name, propertyDescriptor) {
    },
    "delete": function(name) {
    },
    fix: function() { 
      // As long as this.obj is not frozen, the proxy won't allow itself to be fixed
      return undefined; // will cause a TypeError to be thrown
    }
  } ;
} ;

while (count > 0) {
  var proxy = Proxy.create(handlerFactory()) ;
  
  if ((count % 1000) === 0) {
    util.debug("length: "+proxy.length+" "+JSON.stringify(process.memoryUsage())) ;
  }
  count -= 1 ;
}

If I change line 13 to an empty string, I don't get the memory leak as far as I can tell.

Thanks for getting in touch. Line 13 is the key to my use case - I find that any object I create (or indeed pass in and use) to the closure is never garbage collected, even after the proxy itself should have disappeared. So line 13 is there to make the closure sizeable and hence the memory leak easier to spot. So, I'm not sure whether the proxy is not being a GC victim, or the associated handler object has an incorrect reference count or a hidden reference hanging around somewhere. Any thoughts?

I tried a scenario in this gist where I directly released the reference from the large object, but it did not have a mitigating effect on the heap size.