Symfony version(s) affected

4.4.20

Description

Probaby the interface should allow to return null value as well.
In case of data type ?object.

https://github.com/symfony/serializer/blob/8efe86f60f594882f118a319ef8fac9353d67b84/Normalizer/DenormalizerInterface.php#L35

How to reproduce

Possible Solution

Add to interface anotation return type null

Additional Context

No response