Explosives such as gunpowder and slurtle slime will deal the same work damage to trees, boulders and the such the same value no matter how many are in a stack.
This isn't usually much of a problem for gunpowder since it has such a high work damage, however slurtle slime has a low work damage.
Changing line 41 to
v.components.workable:WorkedBy(self.inst, self.buildingdamage * stacksize)
1. Notice that the work damage provided by slurtle slime exploding is the same no matter the size of the stack