docs: @Override
      public void close() {
          for (T unusedInstance; (unusedInstance = unusedInstances.poll()) != null;) {
              if (unusedInstance instanceof AutoCloseable) {
                  try {
                      ((AutoCloseable) unusedInstance).close();
                  } catch (final Exception e) {
                      // Ignore
                  }
              }
          }
      }