When you combine two tools by crafting or by anvil, the damage values are different than what they should be. The tools tested were pickaxes, with 1 use left.
Key: <Tool>: Crafting: <Durability of tool when combined by crafting>, Anvil: <Durability of tool when combined with an anvil>
Wood Pickaxe: Crafting: 4/59, Anvil: 9/59
Stone Pickaxe: Crafting: 8/130, Anvil: 17/130
Iron Pickaxe: Crafting: 14/250, Anvil: 32/250
Gold Pickaxe: Crafting: 3/32, Anvil: 5/32
Diamond Pickaxe: Crafting: 80/1561, Anvil: 189/1561
There seem to be patterns. Let's mark the format: Crafting: a/c, Anvil: b/c.
((b-a)/c)= between 0.06 and 0.09. (a/b)=between 0.42 and 0.47, except for the gold pickaxe, which was 0.6.
For the gamemode, I put survival, as that was when I first noticed, but further testing revealed it works in all gamemodes.
Note that the resulting durability is always more than it logically should be.
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This is IMO intended.
Repairing tools with the crafting grid results in more durability as the sum of the input with the penalty of losing the enchantments.
Repairing tools with the anvil keeps the enchantments but costs experience.
Hmm... perhaps this could be improved? Maybe the resulting durability would only go up while crafting if one or both of the tools are enchanted? Theoretically if they weren't enchanted, it could be exploited to saving materials.
http://www.minecraftwiki.net/wiki/Repair