Does anybody know the effect of slashing/peircing/blunt weapons?

It seems most of the swords in the game are peicering, but they should be slashing... anybody know what the effect of this flag is?

Code:

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; stat_pri      From left to right
;              attack factor
;              attack bonus factor if charging
;              missile type fired (no if not a missile weapon type)
;              range of missile
;              amount of missile ammunition per man
;              Weapon type = melee, thrown, missile, or siege_missile
;              Tech type = simple, other, blade, archery or siege
;              Damage type = piercing, blunt, slashing or fire. (I don't think this is used anymore)
;              Sound type when weapon hits = none, knife, mace, axe, sword, or spear
;              Optional. Name of effect to play when weapon fires
;              Min delay between attacks (in 1/10th of a second)
;              Skeleton compensation factor in melee. Should be 1

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Seems to suggest that its effect is none as it is unused.