+ return strcmp((*(const object_key_t **)key1)->key,
+ (*(const object_key_t **)key2)->key);
+}
+
+static int object_key_compare_serials(const void *key1, const void *key2)
+{
+ return (*(const object_key_t **)key1)->serial -
+ (*(const object_key_t **)key2)->serial;