--- a/src/cx/iterator.h	Sun Oct 19 21:18:17 2025 +0200
+++ b/src/cx/iterator.h	Mon Oct 20 19:44:18 2025 +0200
@@ -50,7 +50,10 @@
      * True if the iterator points to valid data.
      */
     bool (*valid)(const void *);
-
+    /**
+     * Original implementation in case the function needs to be wrapped.
+     */
+    bool (*valid_impl)(const void *);
     /**
      * Returns a pointer to the current element.
      *