Reading in the Introduction on my Kindle DX I noticed I don’t see the “arrow next to the new unless statement”. In the Code example. For that matter the line numbering in the Code example bellow that where you “call out particular lines for reference” is almost so faint that its useless.
The location is 214-41 and the other number in the lower right hand corner is 5205. I hope this can be corrected in the final mobi format.