* @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */
    void mergeDuplicates(Model model, ModelBuildingRequest request, ModelProblemCollector problems);

    /**
     * Sets default values in the specified model that for technical reasons cannot be set directly in the Modello
     * definition.

    private DuplicateMerger merger = new DuplicateMerger();

    @Override
    public void mergeDuplicates(
            org.apache.maven.model.Model model, ModelBuildingRequest request, ModelProblemCollector problems) {
        model.update(mergeDuplicates(model.getDelegate(), request, problems));
    }

    @Override
    public void injectDefaultValues(

        // model normalization
        problems.setSource(inputModel);
        inputModel.update(modelNormalizer.mergeDuplicates(inputModel.getDelegate(), request, problems));

        Map<String, Activation> interpolatedActivations = getProfileActivations(inputModel, false);
        injectProfileActivations(inputModel, interpolatedActivations);