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When you're done with the `CommitBuilder`, you're going to have to call `write_to_repo()`, passing it a mutable `MutableRepo` reference. It's a bit simpler to pass that reference when we create the `CommitBuilder` instead, so that's what this patch does. A drawback of passing in the mutable reference when we create the builder is that we can't have multiple unfinished `CommitBuilder` instance live at the same time. We don't have any such use cases yet, and it's not hard to work around them, so I think this change is worth it.