RMarkdown: reveal.js slide hierarchy

example.Rmd

---
title: "Reveal test"
output:
  revealjs_presentation:
    pandoc_args: [ "--slide-level", "2" ]
---

## Slide 1

This is a slide

# Section 2

This text does not render, but an html slide appears.

It would be great if either:

* A section does not result in an html slide. (I don't know if this is a good idea)

* A section could render content, like a slide.

## Slide 2.1

This is an embedded slide

## Slide 2.2

This is another embedded slide

# Section 3

Another top-level slide

## Slide 3.1

Another embedded slide