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Although it's viable to issue a "plain value" query against a ts-kv-store and then unpack the return value, doing the reverse — launching a ValueAndTimestamp<V> query against a plain-kv-store — seems illogical.

Our vision is that KeyValue  plain-kv-store should always return a plain V. However, for ts-storeskv-store, there's a pronounced need for specialized query types. Ultimately, the user should only be required to define V.

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