docs: public void sealObject() {
          if (!isSealed) {
              final long stamp = slotMap.readLock();
              try {
                  for (Slot slot : slotMap) {
                      Object value = slot.value;
                      if (value instanceof LazilyLoadedCtor) {
                          LazilyLoadedCtor initializer = (LazilyLoadedCtor) value;
                          try {
                              initializer.init();
                          } finally {
                              slot.value = initializer.getValue();
                          }
                      }
                  }
                  isSealed = true;
              } finally {
                  slotMap.unlockRead(stamp);
              }
          }
      }