0.29

NBT support, e.g.,
mc.conn.send("world.setBlock",-1,0,-1,63,1,"{id:"Sign",Text1:"\"ooo\"",Text2:"\"Text2\"",Text3:"\"Text3\"",Text4:"\"Text4\""}")
or:
mc.conn.send("world.setBlocks",0,0,0,5,5,5,63,1,"{id:"Sign",Text1:"My sign"}")