EnumFix.js

var dontEnum = ['toString', 'toLocaleString', 'valueOf', 'toSource', 'watch', 'unwatch', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable'];
var failsEnumTest = (function(){
  for (var k in { toString: {} }) return false;
  return true;
})();

Object.each = function(obj, fn){
  for (var key in obj) fn(obj[key], key);
  if (failsEnumTest)
    for (var i=0,l=dontEnum.length;i<l;i++){
      var key = dontEnum[i], value = obj[key];
      if (value !== Object.prototype[key]) fn(value, key);
    }
};