Hello mojang in the snapshot 14w05 i found a bug. If you put a bow with less durability with an another bow with less durability in the crafting table then you will get a bow with more durability (normal) but then you can take a bow again . And this looks like infinity bows 😞 . I hope i was helpful
(and sry for my very mad english)
dear LudwigFR,
Duplicate of MC-46715 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.