Issue with Spigot-API:

I believe there is a misspelled function name in "World.java" (the world class in "org.bukkit"). The function to get the unique identifier of the world is spelled wrong if you are comparing it to the rest of the API. 

Expected:

I expect the function name to be "getUniqueId".

World world;
world.getUniqueId();

Actual:

What the actual function name is "getUID".

World world;
world.getUID();

This is a very minor bug, however, I believe one of the goals of the Spigot API is to have consistency.