It looks like to be able to support turn costs we have to sacrifice the
ability to use any other extended storage.
I am thinking I can refactor GraphStorage to use an ExtendedStorageManager.
It would allow us to write things like:
TurnCostStorage turnCostStorage =
graph.getExtendedStorageManager().get("turn_costs");
instead of doing:
if (graph.getExtendedStorage() istanceof TurnCostStorage) { ... }
This is just my first guess at what the interfaces should look like, but
does that seem like a change you would appreciate in GraphHopper?
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