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`--all` would make git-annex operate on either every key with content
present (or in some cases like `get` and `copy --from` on 
every keys with content not present).

This would be useful when a repository has a history with deleted files
whose content you want to keep (so you're not using `dropunused`).
Or when you have a lot of branches and just want to be able to fsck
every file referenced in any branch. It could also be useful (or even a
good default) in a bare repository.

A problem with the idea is that `.gitattributes` values for keys not
currently in the tree would not be available (without horrific anounts of
grubbing thru history to find where/when the key used to exist). So
`numcopies` set via `.gitattributes` would not work. This would be a
particular problem for `drop` and for `--auto`.

--[[Joey]]