code: @CheckReturnValue
      @SchedulerSupport(SchedulerSupport.NONE)
      public final Maybe<T> doAfterSuccess(Consumer<? super T> onAfterSuccess) {
          ObjectHelper.requireNonNull(onAfterSuccess, "doAfterSuccess is null");
          return RxJavaPlugins.onAssembly(new MaybeDoAfterSuccess<T>(this, onAfterSuccess));
      }
docs: Calls the specified consumer with the success item after this item has been emitted to the downstream.
  <p>Note that the {@code onAfterNext} action is shared between subscriptions and as such
  should be thread-safe.
  <dl>
  <dt><b>Scheduler:</b></dt>
  <dd>{@code doAfterSuccess} does not operate by default on a particular {@link Scheduler}.</dd>
  </dl>
  <p>History: 2.0.1 - experimental
  @param onAfterSuccess the Consumer that will be called after emitting an item from upstream to the downstream
  @return the new Maybe instance
  @since 2.1