@@ -289,7 +289,7 @@ public function unserialize($serialized = null, $delimiter = null)
289289 * @return string The serialized array
290290 * @see \TechDivision\Import\Serializer\SerializerInterface::serialize()
291291 */
292- public function serialize (array $ unserialized = null , $ delimiter = null )
292+ public function serialize (? array $ unserialized = null , $ delimiter = null )
293293 {
294294 return $ this ->getValueCsvSerializer ()->implode ($ unserialized , $ delimiter ? $ delimiter : $ this ->getMultipleFieldDelimiter ());
295295 }
@@ -319,7 +319,7 @@ public function explode($value = null, $delimiter = null)
319319 * @return string|null The compatected value
320320 * @see \TechDivision\Import\Serializer\SerializerInterface::serialize()
321321 */
322- public function implode (array $ value = null , $ delimiter = null )
322+ public function implode (? array $ value = null , $ delimiter = null )
323323 {
324324 return $ this ->serialize ($ value , $ delimiter );
325325 }
@@ -332,7 +332,7 @@ public function implode(array $value = null, $delimiter = null)
332332 *
333333 * @return array The array with the denormalized attribute values
334334 */
335- public function denormalize (string $ value = null , bool $ unpack = true ) : array
335+ public function denormalize (? string $ value = null , bool $ unpack = true ) : array
336336 {
337337
338338 // initialize the array for the attributes
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