I really like the level of that documentation. Very beginner friendly, with a reasonable level of completeness mingled within. A short diversion for basic std::env::args() access, with a quick switch to using clap for decent common behaviour.
Having worked on a project written in nim today the contrast is huge: The documentation isn't great, the stdlib argument parsing is odd, if you use argparse¹ then nim-using devs expect different behaviour, etc.