Java Edition 12w49a

12w49a is the first snapshot released for 1.4.6.

Additions

 * Added Firework Rocket (sound effects will come soon)
 * Added Firework Star
 * Fireworks are customizable by crafting
 * Added Enchanted Books for enchanting items
 * Added Nether Brick Slabs

Changes

 * When holding sneak, the player can place blocks and items (like redstone, repeaters, and levers) directly onto blocks such as crafting tables, furnaces, and dispensers.
 * The blast radius of fireballs a specific Ghast shoots can be customized with an editor

Fixes
16 bugs fixed

From released versions before 1.4.6
 * – [1-9] clicking an item out of a furnace does not give XP
 * – Mobs can still revert farmlands to dirt even if mobGriefing gamerule is set on false
 * – Setting an Enderman on fire with flint and steel, or lava, will not make it teleport away
 * – Animals on fire do not flee
 * – Boats always get placed in the same direction and not based on how they get placed
 * – Endermen cannot dodge flame arrow. When the arrow is shot the Enderman moves out of the way but is still set on fire
 * – When you enter the Nether, the game auto-selects the first item on the toolbar
 * – Leaves have the Incorrect Tool Tip
 * – "Drowning" in creative
 * – Enchant command cannot enchant with ID 0 (Protection)
 * – You don't hear the xp sound you get every 5 levels
 * – Minecarts and falling entities flickering / jittering (updated 1.4.5)
 * – Passsive mob spawn eggs don't consume
 * – Endermen don't open their mouth when attacked by other mobs
 * – Pressing F3+B displays hitboxes.. rendering invisibility potions useless
 * – wither can sometimes destroy its own star due to the posthumous detonation of wither skulls.