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by DefineOutside 910 days ago
Mojang wrote a DFU system called Data Fixer Upper.

It is open source, peggs the CPU at 100% on startup for about a minute, doubles game launch time, references 10 research papers, sometimes corrupts the world, and is so abstract only the author knows how it works - all to upgrade game worlds to new versions.

It is often called Data Fucker Upper.