In that case, annotating the actual type will help bindings use the correct type.

Compared the gir before and after, and confirmed that the type was changed:
--- Birb-1.0.gir    2025-02-14 01:51:51.510647952 -0500
+++ build/birb/Birb-1.0.gir 2025-02-14 01:51:57.782682982 -0500
@@ -644,7 +644,7 @@
           <doc xml:space="preserve"
                filename="birb/birbqueuedoutputstream.h"
                line="92">The new stream.</doc>
-          <type name="Gio.OutputStream" c:type="GOutputStream*"/>
+          <type name="QueuedOutputStream" c:type="GOutputStream*"/>
         </return-value>
         <parameters>
           <parameter name="base_stream" transfer-ownership="none">