I am building a bridge through the Nether, out of Nether Brick. The only issue, is that the bridge enters the bounds of a Nether Fort, meaning that Blazes, and Wither Skeletons can spawn on it.
I know that they cannot spawn on right-side up stairs, and half slabs, if placed on the ground (half a block below the normal block height). This is due to the block not considered as being a "full" block.
However, if I place stairs upside down, will this still be the case?