Made it possible to enable associative array normalization in JsonbSerializedType

Type/JsonbSerializedType.php

@@ -28,6 +28,11 @@ abstract class JsonbSerializedType extends JsonbType
      */
     private static $serializer;
 
+    /**
+     * @var bool
+     */
+    private static $jsonDecodeAssociative = false;
+
     /**
      * Sets the factory used to construct the used Serializer instance.
      *
@@ -38,6 +43,11 @@ abstract class JsonbSerializedType extends JsonbType
         self::$serializerFactory = $factory;
     }
 
+    public static function setJsonDecodeAssociative(bool $jsonDecodeAssociative): void
+    {
+        self::$jsonDecodeAssociative = $jsonDecodeAssociative;
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -69,7 +79,7 @@ abstract class JsonbSerializedType extends JsonbType
             $value,
             $this->getDeserializationType(),
             'json',
-            ['json_decode_associative' => false]
+            ['json_decode_associative' => self::$jsonDecodeAssociative]
         );
     }