You are able to go outside 30,000,000 blocks by riding minecart and being pushed by other player/entity/mob and will NOT result in a kick for invalid position-ect.

This is not the world border-type feature that i'm talking about. It is the EDGE of where terrain stops generating completely. Not the striped world barrier thats customizable.. You can get outside of where terrain stops generating. and into the far lands. If you use command blocks to teleport the minecart you can get up to 60,000,000 blocks Out of the normal 30,000,000! scary!

Happens in all version since the terrain has stopped being generated at 30,000,000.0 blocks
From 1.8 to 1.8.7

The clouds will glitch out and you will fall to around y=0 and your hand will not render properly.

that is EXACTLY 30,000,000.0 (The last . is not a comma but a decimal)