private void nextAliveEntry() {
        while (entryIterator.hasNext()) {
          Entry<IntReference<V>> entry = entryIterator.next();
          V v = entry.getValue().get();
          if (v == null) {
            continue;
          }
          int key = entry.getKey();
          nextVEntry = new SimpleEntry<>(key, v);
          nextReferenceEntry = entry;
          return;
        }
        nextVEntry = null;
      }
private void nextAliveEntry()