Why is the notifier module private?

[blackghost1987]

I would like to create a central instance of the Airbrake notifier but the Notifier type is in the notifier module, which is private. This way I can't pass around the configured Notifier object, because I can't define the type for the function params and such.
Is there a reason why this type is private? I would think that a value returned by the a public function of the lib should have a type which is also public.