title: Is it possible to gain access to the non-polyfilled version of a function?
body: <p>I'm trying to lock down a Javascript environment.  As part of this, I want to remove access to certain functions-  let's say the File functions.  I want them to all throw an exception when used.  I can polyfill these fairly easily.  I was wondering if that's sufficient-  can a script gain access to the original, non-polyfilled version of the function through some method, or is it restricted to the polyfilled ones?</p>