diff -r 4ebb27ff6f76 -r 748d0d40881e src/cx/iterator.h
--- a/src/cx/iterator.h	Sun Sep 21 18:42:18 2025 +0200
+++ b/src/cx/iterator.h	Sun Sep 21 19:31:30 2025 +0200
@@ -70,6 +70,10 @@
      */
     void (*next)(void *);
     /**
+     * Original implementation in case the function needs to be wrapped.
+     */
+    void (*next_impl)(void *);
+    /**
      * Indicates whether this iterator may remove elements.
      */
     bool mutating;