Can someone from the EB Team tell me why the following units are marked as mercenaries in EDU?

- Roman Infantry Evocatae
- Roman Infantry Principes (Polybian)
- Roman Cavalry Polybian Equites

This makes them recruitable as mercenaries, which doesn't make much sense to me.

On the other hand, IMO, roman auxilia units should be marked as mercenaries:

- Roman Missile Archer Auxilia
- Roman Infantry Auxilia Pedites Extraordinarii
- Roman Infantry Eastern Auxilia
(Roman Infantry Western Auxilia is already marked as mercenaries, I don't understand why the Eastern type is not)
- Roman Cavalry Auxilia Equites Extraordinarii
- Roman Cavalry Auxilia Equites Germanorum
- Roman Cavalry Auxilia Equites Hispanorum
- Roman Cavalry Auxilia Equites Thracum
- Roman Cavalry Auxilia Equites Gallorum