Symfony version(s) affected: 4.4.X

Description
The Symfony\Component\Serializer\Normalizer\DateIntervalNormalizer does not accept negative dateinterval.
On the other hand, Doctrine\DBAL\Types\DateIntervalType, can deal with negative dateinterval.

Although, the ISO 8601 allows negative values to be defined.

Is it a wanted behaviour?
Do I misundestand something?

Thanks a lot for your help!

Possible Solution
Accept negative values on this normalizer.