See attached savegame. My caravel has enough XP to be promoted, and the End Turn button has been replaced with PROMOTE A UNIT, but I don't actually have to. If I bombard Nanjing (using up the Caravel's turn), then I'm allowed to end-turn. So I can save up that healing promotion indefinitely. (In contrast, if I simply move the Caravel, I am forced to use the promotion) This doesn't appear to happen with my melee units. Is this intended design?