// Every container key is smaller than the target_key. In this case we 'wrap around' the
// table and select the first element.
if (closest_key == std::u32::MAX) {
    let result = self.containers.get_first();
    match result {
        None => {
            return Err("Did not find first entry.");
        }
        Some((_, entry)) => {
            let container_id = &entry.id;
            return Ok(container_id);
        }
    }
}