[Prototype-core] Function.prototype.bind optimization

[Yaffle]

Function.prototype.bind may work 2 times faster, if when calling bind
with one argument,it would return function without "arg.concat"

  bind: function() {
    if (arguments.length < 2 && Object.isUndefined(arguments[0]))
return this;
    var __method = this, args = $A(arguments), object = args.shift();
        if(arg.length)
      return function() {
        return __method.apply(object, concat($A(arguments)));
      };
    return function(){
      return __method.apply(object, $A(arguments));
    };
  }

P.S.  bind function used with one argument very frequently

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