Yeah there were pretty interesting edge cases with calculations. Like, for example, there is still [1] a bug for a whip doing unreasonable amount of damage in some cases because armour penetration logic was pretty much strength/area = penetration power.

And because whip hit only with tiny end, it pretty much went thru any armour

https://www.bay12games.com/dwarves/mantisbt/view.php?id=2712