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Bzr revision metadata that doesn't exist in git:
- revision ids
* one-on-one mapping to git-sha's and revision properties
- file ids
* git-sha+path -> fileid mapping
"bzr" git branch with bzr-specific metadata:
* under refs/remotes/ to hide it from the user
* Tree object with several children:
* ":revisions": single object with mappings from git sha to (bzr revid, revprops, file id mapping object)
* "bzr revision id": single object with mappings from git sha to bzr file id, revision id
.bzr needs extra git metadata:
(for round-tripped revisions only)
* global map from git sha's to bzr revision ids
+ generated by bzr-git (slow) when not present
* per bzr-revision map from git sha to bzr file id, revision id
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