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Potions can be stacked by 16, as well as milk buckets. Splash and lingering potion will trigger a cooldown on use. Eggs and snow balls will knockback on hit. Snow balls can be stacked by 64.
Attack damage and speed have been updated. There is now also an attack range attribute. Some tools like axes have less range. But hoes have more.
Fighting with your axe will trigger a cooldown on your shield. Using your shield will also cause a cooldown on your axe. Use them with care during a fight, axes are heavy.

So I Heard You Were Talking Crap About Minecraft Combat? Basically a combat update