The DB-backed implementation of the BlockStore interface provided by store performs LoadBlockMeta as part of retrieving block data. The retrieved metadata structure is discarded after its data is used. At a number of call sites, the caller also needs to retrieve the block metadata, which is performed by calling LoadBlockMeta directly, resulting in a second lookup in the metadata "table".

To eliminate redundancy, LoadBlock could return the metadata in a tuple. It's reasonable to expect that any other storage implementations either have a similar data model (as they also need to support LoadBlockPart), or can create the metadata structure cheaply from block data.