code: @Override
      public <R> Future<R> mergeMap(final Function<? super T, ? extends Publisher<? extends R>> mapper) {
          return (Future<R>) MonadicValue.super.mergeMap(mapper);
      }
docs: /* (non-Javadoc)
  @see com.oath.cyclops.types.MonadicValue#flatMapP(java.util.function.Function)