> > > *Jan* Exactly. I think MapState can be dropped or backed by this. E.g. > >> >> Regarding to performance, I have a concern to drop MapSate or use SortedMapState to back it. Although SortedMapState provide API to remove a single key, I would imagine its implementation in runners will different from a map state implementation without order requirement on map keys, which might give different performance on single key access. For example, SortedMapSate's get single key API might be implemented by allEntriesInc(k) - allEntriesExcl(k).
Also, I would assume MapState is implemented by some runners already. So will dropping MapState API means runners will change accordingly? Do I misunderstand? -Rui
