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Old save files break after a patch

A patch adds new fields to the save data, and players' old saves fail to load. What is the best long-term approach?

A.Tell players to delete old saves after each patchB.Never add fields to save dataC.Store a version number in each save and write migration code that upgrades older versions on loadD.Save the whole memory of the game process

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Old save files break after a patch

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