docs: void checkAllExpectedValues() throws BackendException {
          for (final ExpectedValueCheckingStore store : expectedValuesByStore.keySet()) {
              final Map<KeyColumn, StaticBuffer> m = expectedValuesByStore.get(store);
              for (final KeyColumn kc : m.keySet()) {
                  checkSingleExpectedValue(kc, m.get(kc), store);
              }
          }
      }