crypto: Derive PartialOrd and Ord for MerkleNode.

src/crypto/merkle_node.rs

@@ -40,7 +40,7 @@ lazy_static! {
     };
 }
 
-#[derive(Debug, Copy, Clone, Eq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct MerkleNode(pub pallas::Base);
 
 impl MerkleNode {
@@ -76,12 +76,6 @@ impl<'de> Deserialize<'de> for MerkleNode {
     }
 }
 
-impl std::cmp::PartialEq for MerkleNode {
-    fn eq(&self, other: &Self) -> bool {
-        self.0.ct_eq(&other.0).into()
-    }
-}
-
 impl std::hash::Hash for MerkleNode {
     fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
         <Option<pallas::Base>>::from(self.0).map(|b| b.to_repr()).hash(state)