There is one interesting unification setup (which can be implemented later, once we've got S2RAM and hibernation working well): hibernate, then (without damaging the hibernate state, so that we can resume again if needed), resume into S2RAM. If we restart running from S2RAM, great, we've just had a nice fast resume. If we lose power, so that we can't resume from S2RAM, ah well, time to restore from hibernate.
It's a limited use case, but one that some people could benefit from; I can think of the following times when I'd want it:
As you can see, all of these are unusual use cases, and S2RAM is just an optimization; I'd cope with having to do hibernate for every case.
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