Thanks for this comment. I’ve had this book sitting on my To Be Read stack for about 10 months but kept bumping it down because I don’t use Rust, but the title and ToC was compelling enough for me to buy it and hope for non-Rust specific content. Even if your 80% estimate is 20% to large a guess, I’m definitely going to pull it up to the top of the stack and read it instead of passing it over.