I’d like to suggest that this desired chapter on persistence might be better for another and fairly different book. I disagree that it’s pointless to cover this stuff without covering persistence. There is plenty to cover in what it is doing and to do a decent job on the various persistence options and their tradeoffs well could double the books size and dilute it’s focus.
This book has a good clear focus. Using purely functional modules instead of agents as suggested in Saša Jurić’s article poses a really nice counter to the style in this book and it would seem important to try and flesh out the pros and cons of each in some way if possible, but Saša’s own Blackjack example would clearly need revision once other very simple elements were added as he noted himself.
I think some fleshing out of this space in between these two options would be valuable, but I think somebody else should be left the fertile ground of persistence for a different book.
