in akd/src/node_state.rs [70:78]
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
//`label_len`, `label_val`
let len_cmp = self.len.cmp(&other.len);
if let std::cmp::Ordering::Equal = len_cmp {
self.val.cmp(&other.val)
} else {
len_cmp
}
}