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Guess this gets to my other point.

By the time you are 'compatible' then you have implemented everything needed to also be a 'drop-in' but data file formats might need a conversion.

So convert from Minecraft data files to Pumpkin data files. Then it could drop in.

If you need to separately convert files yourself, then it is by definition not drop in

Didn't really mean 'myself'. But if Pumpkin detects an existing world, and does the conversion to their own format. Then it is drop-in.

Even if they supply a tool, isn't it drop-in.

Otherwise I'd so no software in existence is really drop-in. Most of them have some update that has to happen.