barracks, armories and such

[Victoria]

Unfortunately the experience is rounded (no floored just rounded)

rounded up, fully tested

I believe 8 max XP also means that a unit can get at most 8 experience per turn if it is attacked by several units in a single turn.

Nope, unlimited per turn, I got a knight to be shot at by 7 archers to check

Full XP guide linked in my signature

 

[Magma_Dragoon]

what happens when you combine a unit trained without a barracks and unit with the barracks perk into a corps together?

 

[Victoria]

what happens when you combine a unit trained without a barracks and unit with the barracks perk into a corps together?

I did these tests the other day.
The benefits of the unit with more XP are taken regardless of value.
So a corps with 200 XP, promotions A and B and +75% bonus combines with a unit with 205 XP, promotions C&D and 0% bonus.... the Army will have 205 XP, promotions C&D and 0% bonus for XP. The unit will have the average HP of the 2 units.
If 2 units had the same XP, it is the target one that is taken (the one in the blue tile)