public boolean isOffHeap(long address) {
    if ((address & ENCODED_BIT) != 0) {
      return false;
    }
    if (address < 0) {
      return true;
    }

    // shift right 1 to convert to array index;
    address >>= 1;
    return address >= TokenAddress.ADDRESS_TO_OBJECT.length;
  }
The previous value at the address in 're' will be @Released and then the address in 're' will
be set to the @Unretained address of 'v'.
geode-core/src/main/java/org/apache/geode/internal/offheap/OffHeapRegionEntryHelperInstance.java