@Override
    public Updater updater() {
      throw new UnsupportedOperationException(
          "BonsaiReferenceTestPreImageProxy does not implement an updater");
    }
A caching PreImageProxy suitable for ReferenceTestWorldState which saves hashes in an unbounded
BiMap.
ethereum/core/src/main/java/org/hyperledger/besu/ethereum/trie/pathbased/bonsai/storage/BonsaiPreImageProxy.java