usecrate::Stamp;/// Parsed change data returned by parse_change_data, consumed by apply_rollback.
#[derive(Debug)]pub(crate)structChangeData<T>{pubprev_stamp: Stamp,
pubprev_stored_len:usize,
pubtruncated_start:usize,
pubtruncated_values:Vec<T>,
pubprev_pushed:Vec<T>,
}