@Override
  public boolean isKeyEqual(final Object key) {
    if (key instanceof Long) {
      return (Long) key == this.key;
    }
    return false;
  }
get rvv internal low bytes. Used by region entries for transferring to storage
geode-core/src/main/java/org/apache/geode/internal/cache/entries/VersionedStatsDiskRegionEntryOffHeapLongKey.java