Doesn't work with custom array prototype extensions.

[drunkhacker]

If 'Array' type is extended like below, enumeration using for (var i in ...) doesn't work as expected.

Array.prototype.foo = function() { console.log("hi"); }
a = [1,2,3,4,5];
for (var i in a) {
  console.log(i); //foo will be enumerated
}

This causes invalid regular expression error in validate_phone_iso3166 function.