bug

nur_src/data/types/Metadata.php

@@ -803,7 +803,10 @@ class Metadata implements IParametrable {
     if ($items === null) return;
     $index = 0;
     foreach ($items as $key => &$item) {
-      if ($key === $index++) $key = null;
+      if ($key === $index) {
+        $key = null;
+        $index++;
+      }
       $this->ensureSchema($item, $key, $params);
     }; unset($item);
   }