Skeleton/Zombie Horses and Giants are not flagged as undead #45
Description
Skeleton Horses and Zombie Horses were changed to undead in 1.9, but in 1.7 they're still not, which for example means that they take damage from damage potions and are healed by health potions.
Giant Zombies are also not flagged as undead, though vanilla never fixed that.
All 3 of those mobs should be undead.