public static IAsyncObservable <Double> Average(this IAsyncObservable <Int64> source)
        {
            if (source == null)
            {
                throw new ArgumentNullException(nameof(source));
            }

            return(Create <Double>(observer => source.SubscribeSafeAsync(AsyncObserver.AverageInt64(observer))));
        }
        public static IAsyncObservable <Double> Average <TSource>(this IAsyncObservable <TSource> source, Func <TSource, Int64> selector)
        {
            if (source == null)
            {
                throw new ArgumentNullException(nameof(source));
            }
            if (selector == null)
            {
                throw new ArgumentNullException(nameof(selector));
            }

            return(Create <Double>(observer => source.SubscribeSafeAsync(AsyncObserver.AverageInt64(observer, selector))));
        }