public static boolean isSerialized(long address) {
    return delegate().isSerialized(address);
  }
If the value stored at the location held in 're' is returned, then it will be Retained. If the
value returned is 're' decompressed into another off-heap location, then 're' will be
Unretained but the new, decompressed value will be Retained. Therefore, whichever is returned
(the value at the address in 're' or the decompressed value) it will have been Retained.

@return possible OFF_HEAP_OBJECT (caller must release)
geode-core/src/main/java/org/apache/geode/internal/offheap/OffHeapRegionEntryHelper.java