However, in Racket (and Scheme, Lisp, Clojure, LFE, etc.), due to the extra flexibility, the language lets you extend the library in a much easier way (than in

However, in Racket (and Scheme, Lisp, Clojure, LFE, etc.), due to the extra flexibility, the language lets you extend the library in a much easier way (than in Java or C++), so becoming a contributor to said library becomes a viable proposition.