related quote from Carmack: > "A large fraction of the flaws in software development are due to programmers not fully understanding all the possible states the

related quote from Carmack: > "A large fraction of the flaws in software development are due to programmers not fully understanding all the possible states their code may execute in." https://web.archive.org/web/20201229045320/https://www.gamasutra.com/view/news/169296/Indepth_Functional_programming_in_C.php https://web.archive.org/web/20201229045320/https://www.gamas... And variable mutations increase the cognitive load necessary to understand all the possible states.