For the record, Racket gets the "baffle" example right: racket@> (string-upcase "baffle") "BAFFLE" It also passes all of the author's other tests (except

For the record, Racket gets the "baffle" example right: racket@> (string-upcase "baffle") "BAFFLE" It also passes all of the author's other tests (except for the ones involving combining diacritics, but racket includes built-in functions for normalizing such strings so you can work with them)