If someone extends the spacing scale in the Tailwind config with values not supported by tailwind-merge, they need to extend the class groups inset, inset-x, inset-y, top, right, bottom, left, gap, gap-x, gap-y, p, px, …

There should be an easier way to extend these scales. It shouldn't just work for spacing, but also border-radius, color, etc.

Inspired by @nenostra in #48 (comment)