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Continuing my UI experiments but in C++ land now.

Experimenting with an ECS-ish structure with data stored in separate arrays identified by id. Not sure it makes sense since most interaction with the data is not linear iterations, so I don't know how much data locality matters.

Currently putting the data in maps and I don't love having to worry about hash lookup being a cost. Could use array, but that comes with other issues.

Maybe should just go back to pointer tree of heterogenous objects.