To this point, I believe all code changes were always displayed in full, i.e. not just described abstractly by the text. Because of that, I was missing seeing the new implementation of the init! function on that page.
Another surprise to me was that when I was instructed to reload the browser, the “this field is mandatory” validation errors are now always displayed right from the start, even though I haven’t started using the form. Did I make a mistake somewhere (with re-frame being so declarative, typos are easy to overlook), or is this expected behaviour that the book didn’t mention?