Raku is a programming language that spent years in development under a philosophy of torturing the language implementor developer for the sake of the language user. This results in the language and its core classes behaving in a way that it is surprising — particularly to those coming from other languages — but also intuitive. The philosophy also carries over to those who develop modules as well, particularly as certain features in Raku allow for modules to integrate themselves deeply (and often transparently) into the language.