Was the code sample page (https://github.com/flyingmachine/pegthing/blob/master/src/pegthing/core.clj ) written after the book? It contains - what seems like an important - function definition, in-bounds?, for the pegthing in chapter 5 (https://www.braveclojure.com/functional-programming/#Creating_the_Board), which definition is not found in the book.
Thanks for the reply. And, for the code on github (and, of course, for the book). The github code is a VERY helpful. However it is difficult to find, I recommend providing a prominent link to it on braveclojure[dot]com. To other brave-and-true clojurists, the github code is the refactored, more definitive code.
sorry 😞