Box2D.js overwrite original Object.defineProperty

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What steps will reproduce the problem?
1. Use Box2D.js latest browsers Chrome or Firefox (these browsers support 
Object.defineProperty with full specification.
2. From javascript console type:

>> var obj = new Object();
>> Object.defineProperty(obj, "color", {value:'red'})
>> console.log(obj.color); => undefined

The output should be 'red' because these browsers support ecmascript-5

THE LINE OF BUG IS:
   "Object.prototype.defineProperty instanceof Function"

THAT LINE SHOULD BE:
   "Object.defineProperty instanceof Function"

WHY BUG?
   to check if browser support defineProperty
   if(!(Object.defineProperty instanceof Function))

HERE IS THE FULL BUG IN SOURCE CODE
   if(!(Object.prototype.defineProperty instanceof Function)
      && Object.prototype.__defineGetter__ instanceof Function
      && Object.prototype.__defineSetter__ instanceof Function)
   {
      Object.defineProperty = function(obj, p, cfg) {
         if(cfg.get instanceof Function)
            obj.__defineGetter__(p, cfg.get);
         if(cfg.set instanceof Function)
            obj.__defineSetter__(p, cfg.set);
      }
   }

Original issue reported on code.google.com by damp...@gmail.com on 27 Mar 2013 at 6:53

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Thank you SO SO SO MUCH!
This mystical problem just made me crazy!

Original comment by farid.ni...@gmail.com on 30 Aug 2013 at 7:01

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This bug is realy critical, since it destroy native browser functionality. The 
solution is already there and must be integrated as fast as possible.

Original comment by fbueckl...@gmail.com on 30 Aug 2013 at 3:37

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+1 on integration.  to find that one took 3h of my lifetime ... grzzz

Original comment by m...@19f.de on 30 Aug 2013 at 3:39

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This sucked away an entire afternoon truing to hook up QUnit. It uses 
String.localeCompare(). This bug causes that function to raise an "Illegal 
access" exception. Very hard to debug.

Original comment by dave.spr...@gmail.com on 24 Mar 2014 at 12:48