Random Crashes in PE

Operating system: iOS 7.1.2
Minecraft Pocket Edition: 0.9.0

When playing Minecraft Pocket Edition after the world exceeds 2e+01 MB it will no longer show the actual size of the world, after playing for a while it will start warning you that the game is running out of memory ignoring the warning will cause the game to crash, restarting the game will resume from where you last left of before the crash, continuing play will cause the warning to reappear and then crash again.