Congrats! The condition system isn't very well described elsewhere, especially relative to how cool it is. I just ordered your book, looking forward to reading it.
Thank you for the congrats, and the fact that it wasn't described anywhere is the reason for my original frustration, which in turn is the reason why this book exists.
I hope that the book is useful for you; in case of any questions, please feel free to ask me and/or make issues on the GitHub repository of the book. In the worst case, I'll create or expand the book's errata... or write yet another appendix.
