Search indicates the word "later" appears in this book 123 times, about half of them (57 by a quick count) are in contexts of the author saying he'll explain something later in the book. This is an annoying habit and would be better replaced with links to the exact pages where the material occurs.

Alternately/in addition to, an index could be immensely helpful here.

How does a book which speaks so heavily of indices and their value not have an index?

But having commit access and the having ability to fiddle with bugs are two orthogonal sets of privileges...