From 84b95604a6a4c537cdf4fb7027e7e059cd11f09a Mon Sep 17 00:00:00 2001
From: immrsd <103599616+immrsd@users.noreply.github.com>
Date: Fri, 17 Jan 2025 14:32:14 +0100
Subject: [PATCH] Minor fixes and optimizations to Trace and Checkpoint structs
 (#1293)

---
 packages/utils/src/structs/checkpoint.cairo | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/packages/utils/src/structs/checkpoint.cairo b/packages/utils/src/structs/checkpoint.cairo
index 6a61c3a53..484ec6163 100644
--- a/packages/utils/src/structs/checkpoint.cairo
+++ b/packages/utils/src/structs/checkpoint.cairo
@@ -55,9 +55,13 @@ pub impl TraceImpl of TraceTrait {
         let mut low = 0;
         let mut high = len;
 
-        if (len > 5) {
+        if len > 5 {
             let mid = len - len.sqrt().into();
-            if (key < checkpoints[mid].read().key) {
+            let mid_point = checkpoints[mid].read();
+            if key == mid_point.key {
+                return mid_point.value;
+            }
+            if key < mid_point.key {
                 high = mid;
             } else {
                 low = mid + 1;
@@ -89,7 +93,7 @@ pub impl TraceImpl of TraceTrait {
         let checkpoints = self.checkpoints;
         let pos = checkpoints.len();
 
-        if (pos == 0) {
+        if pos == 0 {
             (false, 0, 0)
         } else {
             let checkpoint = checkpoints[pos - 1].read();
@@ -116,17 +120,17 @@ impl CheckpointImpl of CheckpointTrait {
     fn _insert(self: StoragePath<Mutable<Vec<Checkpoint>>>, key: u64, value: u256) -> (u256, u256) {
         let pos = self.len();
 
-        if (pos > 0) {
+        if pos > 0 {
             let mut last = self[pos - 1].read();
 
-            // Checkpoint keys must be non-decreasing
-            assert(last.key <= key, 'Unordered insertion');
             // Update or append new checkpoint
             let prev = last.value;
-            if (last.key == key) {
+            if last.key == key {
                 last.value = value;
                 self[pos - 1].write(last);
             } else {
+                // Checkpoint keys must be non-decreasing
+                assert(last.key < key, 'Unordered insertion');
                 self.append().write(Checkpoint { key, value });
             }
             (prev, value)
@@ -149,7 +153,7 @@ impl CheckpointImpl of CheckpointTrait {
                 break;
             }
             let mid = math::average(_low, _high);
-            if (self[mid].read().key > key) {
+            if self[mid].read().key > key {
                 _high = mid;
             } else {
                 _low = mid + 1;