fix(test): transient failure in test_get_size_beacon_entry (#5931)

hanabi1224 · coderabbitai[bot] · web-flow · commit 17676f67ad50 · 2025-08-14T12:04:29.000Z
Co-authored-by: coderabbitai[bot] &lt;136622811+coderabbitai[bot]@users.noreply.github.com&gt;
diff --git a/src/beacon/beacon_entries.rs b/src/beacon/beacon_entries.rs
@@ -33,6 +33,14 @@ pub struct BeaconEntry {
 
 impl BeaconEntry {
     pub fn new(round: u64, signature: Vec<u8>) -> Self {
+        // Drop any excess capacity to make heap usage deterministic across allocators.
+        // Avoid shrink_to_fit: it's a non-binding hint.
+        let signature = signature.into_boxed_slice().into_vec();
+        debug_assert_eq!(
+            signature.len(),
+            signature.capacity(),
+            "BeaconEntry::signature should be right-sized"
+        );
         Self { round, signature }
     }
 
