docs: public static List<OutlierResult> getOutlierResults(Result r) {
      if(r instanceof OutlierResult) {
        List<OutlierResult> ors = new ArrayList<>(1);
        ors.add((OutlierResult) r);
        return ors;
      }
      if(r instanceof HierarchicalResult) {
        return ResultUtil.filterResults(((HierarchicalResult) r).getHierarchy(), r, OutlierResult.class);
      }
      return Collections.emptyList();
    }