public static IDisposable SubscribeAsyncConcurrent <T>(this IObservable <T> source, IObserverAsync <T> observer, int maxConcurrent) =>
source
.Select(number => Observable.FromAsync(async() => { await observer.OnNext(number); }))
.Merge(maxConcurrent)
.Subscribe();
public static IDisposable SubscribeAsync <T>(this IObservable <T> source, IObserverAsync <T> observer) =>
source
.Select(number => Observable.FromAsync(async() => { await observer.OnNext(number); }))
.Concat()
.Subscribe();