I just counted how many objects I could spawn on my map, and I got 613. So is the limit actually 613, and not 640? I don't think there are any objects that I am forgetting. I counted all the gametype objects as well.
What about objective/hill markers as well as respawn areas? Also the teleporters from the bottom to the top count as 2 objects, so we actually have 638.
I already said I counted all the gametype objects. But I didn't count the two sky bubble teleporters because I didn't see the point in it.