https://github.com/Bukkit/CraftBukkit/commit/80d8c9a20ece0e4fb5948f850ff2067dc3f78258 Does that mean all damage values will be removed for items that don't use damage values in vanilla? If it does, I don't like it at all. I (and lot of other people, I think) use data-values to manage custom items. This would break all plugins doing that. So is this true? What's your opinion on this?
jorisk322 I have exactly the same opinion as you. Minecraft and Bukkit theirlves aren't able to make custom items so data-value was the only way to do it. Please, If it is possible, revert that commit.
Why don't you just post it here? That way anybody who sees this thread will find it. I worked around it in my plugin by using custom display-names/lores.
using meta is much safer to do this and prevents conflicts with future MC additions. see wool damage values above 15 causing clients to crash, and leaves/slabs changing their data values in older versions.