public Throttle(
	int cost,
	TimeSpan per,
	int maximumBurst,
	Func<T, int> costCalculation,
	ThrottleMode mode
)

new : 
        cost : int * 
        per : TimeSpan * 
        maximumBurst : int * 
        costCalculation : Func<'T, int> * 
        mode : ThrottleMode -> Throttle