Storing state in $GIT_DIR

Is there a convention of where/how it is safe to store additional
(non-git) data in $GIT_DIR?

The arch import needs to keep a cache with arch-commit-id  =
git-commit-id mappings, and some notes about what patch-trading Arch
recorded. It'd be great to be able to store those in
$GIT_DIR/archimport/ . Is that supported?

It does not need to be replicated with push or pull, merely preserved. 

cheers,


martin
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