I've often thought it would be interesting to see an ebook format that would allow one to toggle between versions of the text or display text inline as some kind of diff.
I say this because there are some authors that I read who have revised their works many times, and sometimes I prefer an earlier version over a later revision.
I've been using this approach and it works amazingly well (for text-based formats like .tex and .md). I switched from mercurial to git because rebasing feels much more natural. I'm currently actively maintaining five different versions of a book in parallel as separate branches. The `master` branch sees the most fixes then I rebase the five branches.
Anyway, it's great to see books stored in git. Mark my words, this will be a big thing for education!
