List<String> oldRepos = request.getModelRepositoryHolder().getRepositories().stream()
                        .map(Object::toString)
                        .toList();
                request.getModelRepositoryHolder().merge(model.getRepositories(), false);
                List<String> newRepos = request.getModelRepositoryHolder().getRepositories().stream()
                        .map(Object::toString)

     * User properties
     */
    @Nonnull
    Map<String, String> getUserProperties();

    @Nonnull
    ModelResolver getModelResolver();

    @Nonnull
    ModelRepositoryHolder getModelRepositoryHolder();

    @Nullable
    ModelCache getModelCache();

    @Nullable
    Object getListener();

    @Nullable
    ModelBuilderResult getInterimResult();

    @Nullable