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Implement
MutableTree#DeleteVersions
. This method will be used in the revised pruning strategy in the Cosmos SDK, where pruned versions will be deleted in "batches" as opposed to on a block-by-block basis.@erikgrinaker feel free to keep this PR open while you tackle removing pruning from the IAVL as I know you'll also further optimize this method. Or you can also merge this and address optimizations later.
/cc @zmanian