Missing generator distinctArrayOf

[Vinai]

It would be lovely to have something like gen/vector-distinct, only for our trusty PHP arrays.

[steos]

It would be great to have this. It is not trivial to implement though (see https://github.com/clojure/test.check/blob/000000076395383d824ec8a468a88ee2baa6f121/src/main/clojure/clojure/test/check/generators.cljc#L690).