If that's happening, it'll be a Forge thing. Nothing in vanilla does that, same as before.
And if Forge does add a system to allocate IDs, then the same system would work in any version of Minecraft. All the way back to Beta 1.7.3, or whenever Forge was created. It wouldn't be something that was impossible to do before 1.7.
And if Forge does add a system to allocate IDs, then the same system would work in any version of Minecraft. All the way back to Beta 1.7.3, or whenever Forge was created. It wouldn't be something that was impossible to do before 1.7.