Makes parseInt default to radix of 10.

parseint.js

// Protect against parseInt being used
// without radix, by defaulting to 10.

// Conditionally check value, in case
// future implementations of parseInt
// provide native base-10 by default.

(function(window) {
  var _parseInt = window.parseInt;

  if (_parseInt('09') === 0) {
    window.parseInt = function(str, radix) {
      return _parseInt(str, radix || 10);
    };
  }
})(this);