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World id is not the same as zone id, nor is it new. Both have been around since the dawn of time. Some APIs use world, some use zone. Typically it depends on where the data comes from (we have WorldDefs and ZoneDefs.) Once upon an eon ago, a world could consist of multiple zones, but that was long before the game ever shipped. Now there's a one to one relationship between the world and the zone. For instance, Stonefalls is Zone id 41, World id 198.
Typically positions are world positions, which is why I used world id, but looking through the API, it seems like we usually use zone id to expose it and just get the world id from the zone in the code. So I probably need to change the new API to use zone id instead, to keep it consistent.
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