Little question about catapults

[Zhayedan]

I always wondered, if they have a limited number of shots, like 20 each, and different types of projectiles, shouldn't they logically have 20 of each projectiles and be able to fire other projectiles when a certain type of shot runs out?
Same question can be asked about archers and their heavy/standard/whistling shots.

[Kraut and Tea]

And how would that be implemented?

[Zhayedan]

by the current mechanics, you can either throw (let's say) 20 standard shots or 20 explosives or 20 poison projectiles, but it doesn't explain what happens to the poison or explosive shots if you use all the 20 to throw standard projectiles... right? instead, you can have 10 of each, if you prefer to use catapults for explosives, fine, fire them first. but when they run out, you must have other projectiles to throw too. am i wrong?