Bound individual size of allocation to put in free list

ConflictSet.cpp

@@ -260,7 +260,8 @@ static_assert(sizeof(Node4) < kMinChildrenNode4 * kBytesPerKey);
 
 // Bounds memory usage in free list, but does not account for memory for partial
 // keys.
-template <class T, int64_t kMemoryBound = (1 << 20)>
+template <class T, int64_t kMemoryBound = (1 << 20),
+          int64_t kMaxIndividual = (1 << 10)>
 struct BoundedFreeListAllocator {
   static_assert(sizeof(T) >= sizeof(void *));
   static_assert(std::derived_from<T, Node>);
@@ -296,7 +297,8 @@ struct BoundedFreeListAllocator {
     --liveAllocations;
 #endif
     static_assert(std::is_trivially_destructible_v<T>);
-    if (freeListBytes >= kMemoryBound) {
+    if (sizeof(T) + p->partialKeyCapacity > kMaxIndividual ||
+        freeListBytes >= kMemoryBound) {
       return free(p);
     }
     memcpy((void *)p, &freeList, sizeof(freeList));