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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.
+
+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]]