N'indique que les enfants directs des interfaces.

src/SerializationMapper.php

@@ -181,12 +181,6 @@ final class SerializationMapper implements TypeFactoryInterface
 
         $properties = $this->mapProperties($classInfo->getProperties());
 
-        $children = [];
-        /** @var PHPClass $class */
-        foreach ($classInfo->iterateDescendants(ClassInfo::INTERFACE) as $class => $descendant) {
-            $children[] = $this->get($class->getFullName());
-        }
-
         if ($this->withAtFields) {
             $resources = $this->getResourceClassesOf($resourceClass);
             $resourceTypes = array_map([Placeholder::class, 'get'], array_keys($resources));
@@ -216,6 +210,14 @@ final class SerializationMapper implements TypeFactoryInterface
         $desc[] = sprintf('Serialization groups: %s', implode(', ', $this->serialization->getGroups()) ?: '-');
         $desc = trim(implode("\n", $desc));
 
+        $children = [];
+        /* @var PHPClass $class */
+        foreach ($classInfo->getChildren() as $child) {
+            if ($child->isInterface()) {
+                $children[] = $this->get($child->getResource()->getFullName());
+            }
+        }
+
         return new InterfaceType($repr->getName(), $parent, $properties, $desc, $children);
     }