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    KvRequestData:
        | { tag: "KvGetRequest"; val: KvGetRequest }
        | { tag: "KvListRequest"; val: KvListRequest }
        | { tag: "KvPutRequest"; val: KvPutRequest }
        | { tag: "KvDeleteRequest"; val: KvDeleteRequest }
        | { tag: "KvDropRequest"; val: KvDropRequest }

    Request/Response unions