4 * object.name (git name-rev)
8 * git revert, stash, rebase
10 * more low level index actions
11 - (with_index), checkout-index, read-tree, write-tree, update-ref
19 - prune, fsck, pack-refs, gc, count-objects, unpack-objects
21 * email/patch integration
22 - request-pull(email_address), git-am, git-apply
25 * compatible with git 1.4
29 * More Git::Status methods
32 * Speed up through pure ruby
34 * Speed up through C bindings to libgit-thin