This release is this book's first content-complete release (for C++20).

While this doesn't mean that this is the last update (there will be a C++23 update once there is sufficient compiler support), I need to concentrate on other bigger projects. This book was constantly looming over my head as unfinished.

There are too many small changes to summarize here, but the big one is that each example in the book now has a Compiler Explorer link.

Enjoy 😁