Tools, Swords, Bows, Potions, and Armor cannot stack using /give

I remember that using /give (player) iron_sword 64 would give that player 64 iron swords, in one stack.

However, when I tried to do this in any gamemode, with any tool, weapon, armor, or potion, it filled up my inventory with individual items. They did not stack.

Was this simply changed in 1.8? I know that they changed a lot of things, and maybe I simply didn't notice this before. It's just a really annoying bug because it's interfering with a custom map I'm trying to make...