docs: public static <E> Collection<E> dependencyObjectify(Tree t, HeadFinder hf, TreeTransformer collinizer, DependencyTyper<E> typer) {
      Collection<E> deps = new ArrayList<E>();
      Tree t1 = collinizer.transformTree(t);
      if(t1==null)
        return deps;
      dependencyObjectifyHelper(t1, t1, hf, deps, typer);
      return deps;
    }