Member Junction
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    ApplyResultCode:
        | "SUCCESS"
        | "DROP_NOT_CONFIRMED"
        | "STALE_DELTA"
        | "INVALID_TOKEN"
        | "PERMISSION_DENIED"
        | "TARGET_NOT_FOUND"
        | "PARTIAL_SUCCESS"
        | "UNEXPECTED_ERROR"

    Result codes returned by ApplyDelta and the high-level convenience operations. Every non-SUCCESS code maps to a user-visible failure mode the UI must handle explicitly.