- Completed merge

src/QueryBuilder.php

@@ -463,7 +463,7 @@ class QueryBuilder implements Query\QueryBuilderInterface
 
     public function getFragments(/*? Query\Fragment|array*/ $fragment = null) : array
     {
-        return $fragment === null ? array_filter($this->queryStack, fn($e) => get_class($e) === $fragment) : $this->queryStack;
+        return $fragment !== null ? array_filter($this->queryStack, fn($e) => is_a($e, $fragment, true) ) : $this->queryStack;
     }
 
     public function __toString() : string