so git could get corrupted, but it would not be corrupted by overwriting old data and loosing it, it would be corrupted by not saving new data (much easier to detect as that is the data that people would be trying to use)
there is an option in git (I don't remember if it's compile time or not) to do additional checking when saving data to check that the data is the same even if it has the same hash, and give an error if it's not the same.
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