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Footnote 3: git prune deletes all objects that cannot be reached from a ref. If the user runs this command, they may lose content.

In what cases would a user lose content? When something is added but not committed only?

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When you've committed something, but then rebased or reset the branch position so the commit is not longer in the history of any branch or tag. This usually isn't a problem, because when you rebase work you are making a copy of the commit so references to the data should be the same.

I also think it's worth noting, `git gc`, which is triggered automatically occasionally, actually runs `git prune`.

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