docs: public void remove(int i, PersistentStore store) {
  
          writeLock.lock();
  
          try {
              CachedObject r = release(i);
  
              if (r != null) {
                  int size = r.getStorageSize();
  
                  freeBlocks.add(i, size);
              }
          } finally {
              writeLock.unlock();
          }
      }