There would be the limit of the persistent level. THe main one, containing all others. Ah, and minecraft doesn't have an infinite world. at something like million world generation stops and you have a flat grass world, which then after some time stops colliding (you fall and die) and if you fly through 20 blocks(using a command) above the noncolliding blocks, the game freezes. Also, at one million things like redstone are getting messy. (Redstone for example is a few times bigger and covers a few blocks one piece).
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