Java Edition 18w10d

18w10d is the twenty-seventh snapshot released for 1.13.

World generation

 * Coral reefs
 * Generate in warm ocean biomes.
 * Are composed of coral and coral plants
 * This allows coral to generate naturally

Blocks

 * Shulker boxes can now be undyed a cauldron.
 * The water level in the cauldron will decrease by 1.

Mobs

 * Phantoms now burn in sunlight and no longer despawn during daytime.
 * Baby zombies now burn in sunlight

General

 * Water physics.
 * Water can now be placed in ender chests, trapdoors, ladders, and signs.
 * Water no longer goes through solid faces.
 * Big optimizations to how clouds are rendered.