The book is interesting for another reason: It was written by a bunch of authors in a short time using git, and book is still being updated, too.
https://github.com/HoTT/book/commits/master
It might be less of a book and more of an experiment for a new research model.
I’ve been following it for a while, but haven’t sat down to read it, so this may be a good opportunity.
--
Kyle Marek-Spartz