--- /dev/null
+// fast apply, http://jsperf.lnkit.com/fast-apply/5
+module.exports = function(fn, args, that){
+ var un = that === undefined;
+ switch(args.length){
+ case 0: return un ? fn()
+ : fn.call(that);
+ case 1: return un ? fn(args[0])
+ : fn.call(that, args[0]);
+ case 2: return un ? fn(args[0], args[1])
+ : fn.call(that, args[0], args[1]);
+ case 3: return un ? fn(args[0], args[1], args[2])
+ : fn.call(that, args[0], args[1], args[2]);
+ case 4: return un ? fn(args[0], args[1], args[2], args[3])
+ : fn.call(that, args[0], args[1], args[2], args[3]);
+ } return fn.apply(that, args);
+};
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