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From studying the dulwich code, direct manipulation of the message field of the object is not possible as the message forms part of the data that is hashed to create its id which is how the proper file is found.
Even tag_delete does not remove that annotated tag objects hash file, it just deletes the reference to it.
So changing an annotated tag message field directly is not possible, and using tag_delete and tag_create will just leave orphaned hash files in the repo.
Perhaps expanding the role of the .bookinfo file to keep a tag description for every tag is the right way to go here.
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