nst { items, renderItem, keyFn = (item, index) => index, placeholder } = props;
            

            function smartDiff(parentElement, newItems, renderItem, keyFn, context) {
                const existingNodes = Array.from(parentElement.children);
                
                // If no existing nodes, do initial render
                if (existingNodes.length === 0) {
                    return initialRender(parentElement, newItems, renderItem, keyFn, context);
                }
                
  