Prevent JavaScript extensions/replacement of native objects because implicit dependencies and evil.js are bad things

gistfile1.js

var classes = [Object, Array, String, RegExp, Date, Number, Function];
var nonClasses = [Math, JSON, console];

classes.concat(nonClasses).forEach(function (o) {
  Object.freeze(o);
});
classes.forEach(function (o) {
  Object.freeze(o.prototype);
});

// if in browser, freeze: document, XMLHttpRequest, alert, prompt as wel