I tested this with Unbreaking III on a pickaxe and it seems that when it reaches "0" durability you can still use the tools quite a few times, more than you could previously.
EDIT: I spawned a pickaxe with 1 point of durability and enchanted it with Unbreaking III and from what I can see the amount of blocks I can mine before the tool breaks is different everytime. One time I could mine 9 blocks of dirt, the other time, only 6 blocks of stone. Should that be the case?
Comments 3
Yes, I made my assumptions too quickly, but there's still something odd about durability. I updated the description.
That's how unbreaking works, it has a change to reduce durability.
(wiki is not an official source, but is correct in this case):
For most items, (100/(Level+1))% chance a use reduces durability. On average, lifetime is (Level+1) times as long.
For armor, (60 + (40/(Level+1)))% chance a use reduces durability. (In other words, each durability hit against “unbreaking” armor has a 20%/27%/30% chance of being ignored.) Thus, on average, armor lasts 25%/36%/43% longer.
When durability is reduced by multiple points (e.g. hooking a mob with fishing rods or Thorns armor), Unbreaking is applied for each point of reduction.
This has always been the case, but is now noticeable due to the fix of MC-1040.