@Override
  @Retained(ABSTRACT_REGION_ENTRY_PREPARE_VALUE_FOR_CACHE)
  public Object prepareValueForCache(RegionEntryContext r,
      @Retained(ABSTRACT_REGION_ENTRY_PREPARE_VALUE_FOR_CACHE) Object val, boolean isEntryUpdate) {
    return prepareValueForCache(r, val, null, isEntryUpdate);
  }
Any bits in "bitMask" that are 0 will be cleared.
geode-core/src/main/java/org/apache/geode/internal/cache/entries/AbstractRegionEntry.java