Synchronous, read-only view of the persisted refcounting state.
Both LMDB and fjall offer synchronous reads, so reads can go straight
to the backing store. All writes go through ValueRefsUpdate batches
instead, since persistent backends can only write asynchronously
(LMDB transactions, fjall inserts + persist).
Synchronous, read-only view of the persisted refcounting state.
Both LMDB and fjall offer synchronous reads, so reads can go straight to the backing store. All writes go through
ValueRefsUpdatebatches instead, since persistent backends can only write asynchronously (LMDB transactions, fjall inserts + persist).