// Defaults
    var Observer = Rx.Observer,
        Observable = Rx.Observable,
        Notification = Rx.Notification,
        VirtualTimeScheduler = Rx.VirtualTimeScheduler,
        Disposable = Rx.Disposable,
        disposableEmpty = Disposable.empty,
        disposableCreate = Disposable.create,
        CompositeDisposable = Rx.CompositeDisposable,
        SingleAssignmentDisposable = Rx.SingleAssignmentDisposable,
        slice = Array.prototype.slice,
        inherits = Rx.internals.inherits,
        defaultComparer = Rx.internals.isEqual;

    function argsOrArray(args, idx) {
        return args.length === 1 && Array.isArray(args[idx]) ?
            args[idx] :
            slice.call(args);
    }