I found a strip mine under my towny plot (My town is Imperial) and followed it down to bedrock. I found a tunnel that wasn't completed, and attempted to continue the shaft further, but when I used my pick on the cobblestone I got teleported to the bottom of the ocean somewhere. As I was drowning a message came up that I had reached the edge of the world.
I would expect the edge of the world to 1) give a warning BEFORE I reach it and 2) not teleport me to the bottom of the ocean to die.
I would expect the edge of the world to 1) give a warning BEFORE I reach it and 2) not teleport me to the bottom of the ocean to die.