Function cads

pub(crate) async fn cads<T, O, C>(
    txns_since: &mut SinceHandle<C::Key, C::Val, T, i64, O>,
    new_since_ts: T,
)
where
    T: Timestamp + Lattice + TotalOrder + StepForward + Codec64 + Sync,
    O: Opaque + Debug + Codec64,
    C: TxnsCodec,