Developers, as you know, Spigot uses version based packagenames, like net.minecraft.server.<version> package for modified vanilla server classes and org.bukkit.craftbukkit.<version> package for the CraftBukkit staff. The problem is, that plugins, which are using classes from these packages will break on every Spigot version update. Plugin devs usually solves this problem using reflection or making classes for every version. Both of these solutions are absolutely inefficient, because they are decreasing the servers performance, increases the RAM usage and causes unneccessary extra work for the plugin developers. So my idea will be a very very simple thing: Spigot Team, please don't use the server version number in these package names!