Do they honestly expect me to believe that there wasn't a more appropriate way to abbreviate "cumulative maximum" than cummax? Imagine the headaches the inventor of the world's first Python powered sexbot will suffer when they realise that the method name cummin has already been taken.
use polars, its much faster. Unfortunately it still has the cum methods but theres an underscore in the middle if that makes it better.
Definitively makes it worse.