Java Edition 15w40a

15w40a is the twenty-ninth snapshot released for 1.9.

Changes

 * Many changes to mob pathfinding.
 * Mobs now avoid cacti and fire.
 * Blazes don't avoid fire.
 * Mobs following a player holding food will now go around water, if possible.
 * Entities panicking and on fire will preferentially run to water within ±5 blocks horizontally and ±4 blocks vertically, even if they can't actually reach it.
 * Shulkers no longer target players or attack in Peaceful.
 * Shulker bullets now despawn in Peaceful.
 * Health regenerates faster when saturation is not empty ( per half-second versus each 4 seconds).
 * Regenerating health increases exhaustion by 4 points rather than 3.
 * Some optimizations.