Interesting Issue

[Aaron Swartz]

> 1.   Asterisk word/phrase emphasis: `You *misheard* me.`
> 2.   Underscore word/phrase emphasis: `You _misheard_ me.`
> 3.   Asterisk emphasis within word: `You *mis*heard me.`
> 4.   Underscore emphasis within word: `You _mis_heard me.`
> 
> Symmetry is nice, but while (1), (2), and (3) all seem like natural ways
> to note an emphasis in plaintext, (4) does *not*; it looks weird, like a
> break in the word, *not* the emphasis of a syllable in it.

This seems like a fair compromise. The only problem I can think of is
if someone wants to say something like "search for *markdown*.txt",
but that should really be backtick quoted anyway because it looks
really weird.