I want to be able to have a list w/ several levels of nesting, but not have the line breaks between them. 

But it looks like that doesn't work

This code:

+ 1
  
  + 2
  
    + 3

Produces

<ul>
<li>
<p>1</p>

<ul>
<li>
<p>2</p>

<ul>

<li>3</li>
</ul>
</li>
</ul>
</li>
</ul>

and displays how I want it, except with line breaks in between (more or less like what the code looks like but
w/ different-shaped bullets).

but this:

+ 1
  + 2
    + 3

makes this:
<ul>
<li>1 + 2 + 3</li>
</ul>

and displays like:
    * 1 + 2 + 3
where that * is a bullet. 

I tried using tabs instead of 2 spaces, which makes it fully work in regular markdown how I want it, but that got the
same result in maruku.