docs: public static final void saveSession(Session session, Bundle bundle) {
          if (bundle != null && session != null && !bundle.containsKey(SESSION_BUNDLE_SAVE_KEY)) {
              ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
              try {
                  new ObjectOutputStream(outputStream).writeObject(session);
              } catch (IOException e) {
                  throw new FacebookException("Unable to save session.", e);
              }
              bundle.putByteArray(SESSION_BUNDLE_SAVE_KEY, outputStream.toByteArray());
              bundle.putBundle(AUTH_BUNDLE_SAVE_KEY, session.authorizationBundle);
          }
      }