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While a solution like this would be the cleanest, it would require that we deprecate the old range interface and migrate existing code to the new interface. Compared to the solution proposed in this KIP, which does not require modifications to the interface and no migration is needed, we felt that making bigger changes to the range interface is not necessary at this point.

Expanding idea of open endpoint range interfaces to other stores (e.g., SessionStore, WindowStore)

There are several other APIs that offer similar range based interfaces. Examples are the findSession interface in ReadOnlySessionStore or the fetch interface in ReadOnlyWindowStore. One could apply similar ideas of applying open endpoint semantics to those interfaces. At this point, however, we decided not to expand the scope of this KIP and leave it to follow-up KIPs to propose changes to those interfaces.