src/main/java/io/reactivex/Maybe.java
@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));
    }
@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));
    }
Converts this Maybe into an Observable instance composing disposal
through.
<dl>
<dt><b>Scheduler:</b></dt>
<dd>{@code toObservable} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>
@return the new Observable instance