@SuppressWarnings("unchecked")
    @CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Observable<T> toObservable() {
        if (this instanceof FuseToObservable) {
            return ((FuseToObservable<T>)this).fuseToObservable();
        }
        return RxJavaPlugins.onAssembly(new MaybeToObservable<T>(this));
    }