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Inventory deltas and more broadly changes between trees are a significant part
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of bzr's core operations: they are key components in status, diff, commit,
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of Breezy's core operations: they are key components in status, diff, commit,
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and merge (although merge uses tree transform, deltas contain the changes that
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are applied to the transform). Our ability to perform a given operation depends
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on us creating consistent deltas between trees. Inconsistent deltas lead to