In core.js you'll find lots of function declerations like the following:
!function(undefined){
var __e = null, __g = null;
// more code
}
Or this one:
!function(){
try {
var iter = [1].keys();
iter['return'] = function(){ DANGER_CLOSING = false; };
Array.from(iter, function(){ throw 2; });
} catch(e){ /* empty */ }
}();
What is the purpose of the negation?
