[chacha21]

RPN is just an option (provided by Chalk). The "minimalist" GUI is just the introduction of the full article. You have to reach <https://chachatelier.fr/chalk/article/chalk.html#toc-36> to go deeper into numerical problems of usual softwares.

Once again, Chalk is not the best software ever, it is just what I have to build myself to fix the problems I usually encounter. Not to say that all other softwares are equally bad, but to my knowledge, none of them will address as much limitations at the same time.