Speedy for Espruino

During my test with a driver for LED panel, @Gordon added a very nice speed up function.

This looks very good, and I gave it a chance to become a seperate function. In first test, it even speeds up bit.
@Gordon, usually you have some good ideas. Could this be a starting point for a kind of prebind, not saying precompile ?

void jswrap_espruino_speedy_callback(int val, void *data){
  JsVar *fnc = (JsVar*)data;
  JsVar *value = jsvNewFromInteger(val);
  if(jsvIsFunction(fnc)) jspExecuteFunction(fnc,0,1,&value);
  jsvUnLock(value);
}
void jswrap_espruino_speedy(JsVar *arrayFunction, JsVar *arr){
  jsvIterateCallback(arr,jswrap_espruino_speedy_callback, arrayFunction);
}