Minecraft wiki entry for After_Beta_1.8, associated text: "It is also worth noting that the Far Lands terrain itself is not due to improper float casts, but rather due to integer overflow (a double value is cast to an int; the fix casts it to a long and ANDs it with 16777215 to limit the value before casting (which could also be 255 since the noise only has 256 steps)." – u/TheMasterCaver on Reddit, November 5, 2018