@CheckReturnValue
    @NonNull
    @BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Completable switchMapCompletable(@NonNull Function<? super T, ? extends CompletableSource> mapper) {
        ObjectHelper.requireNonNull(mapper, "mapper is null");
        return RxJavaPlugins.onAssembly(new FlowableSwitchMapCompletable<T>(this, mapper, false));
    }