If for whatever reason the make-*-cursor-shape functions receive something that's not 'box, 'bar, or 'hbar, currently they'll either return nil and do nothing or trigger a void-variable error, causing the user to have to read the code to see what's wrong.
If for whatever reason the make-*-cursor-shape functions receive something that's not
'box,'bar, or'hbar, currently they'll either return nil and do nothing or trigger a void-variable error, causing the user to have to read the code to see what's wrong.This should fix #19.