AOSO VEINMINING

The tunnel and stair shapes now work anywhere, not just on flat ground. Mining into a wall goes straight in. On a hillside, the tunnel goes into the hill the way you face instead of digging straight down. On level ground, or when looking steeply down, it digs down.
Tunnels carry on through caves and small gaps, and stop before lava.
Stairs now start correctly when you stand on a slab, path, farmland or soul sand, leaving room for your head.