Bukkit/CraftBukkit — comment on commit e9e15f3ea53ace543b90883a86fa68601574f6f9
File:  line 0
By mikeprimm:

That would be incorrect in the vanilla code - oddly enough, the 1.2 vanilla code seems to be less flexible about world height than the 1.1 code was (there were height and height mask type variables on the world data back then, while the current Chunk code (for example) is hard coded to 16 sections of 16x16x16), and setRawTypeID in the n.m.s.World class bounds checks from 0 to 255 hard coded, as well). At this point, we've just followed suite with the vanilla code (I was planning on using the world.heightmask and related variables - even had a 1.1 branch to do it - but they were gone when we got 1.2).