Thanks, yeah. So I guess the concrete example I would cite here is that the most natural (and most efficient?) way of persisting std::map<ptr, ....> would introduce pointer ordering into the output.
Just like the most natural (and most efficient?) way of persisting any std::unordered_map<...> can result in a completely randomly-ordered output, due to a DoS mitigation that some commonly-used language runtimes have.
