In 1.11 there is a new gamerule which kills mobs in a 1 block radius if crammed, will the gamerule be enabled or disabled when we update to 1.11? I didn't have much time to write this so for not much information.
Edit: The gamerules default is 24 mobs so that might harm some people's villager breeders
Edit: The gamerules default is 24 mobs so that might harm some people's villager breeders