Tall Fox: -Have you noticed that this book is basically written by a _lunatic_?
Short Fox: -Yup
Tall Fox: -Seriously, he's way too hyperactive. If he keeps at this frantic pace he's gonna burn out quick.
Short Fox: -Burn out? He's gonna shoot himself in the head by the time he hits 30.
--
From that kind of comment and the pace of his work (bouts of rabid coding interspersed with AWOL periods), I'm afraid he's bipolar. His only output (code, writing, mailing list contributions) in june was a single tweet saying that he was trapped in a labyrinth of his own design.
I sincerely hope he's alright.