here is i tried to add sorting, first by node type then by each of the common field, then the node itself

+    sorted_deps = OrderedDict(sorted(deps.items(), key=lambda t: (type(t[0]), t[0].subject_key, t[0].product, t[0].variants, t[0])))
+    return (StepRequest(self._step_id, node, sorted_deps, self._project_tree), Promise())