ContributionsMost RecentMost LikesSolutionsOAS 3.0.1 trying to make $ref nullable Hi! I have a field of object type payerFeeSum: $ref: '#/components/schemas/MoneyDto' And I want it to accept also null value. In kotlin it should look like so: var payerFeeSum: MoneyDto? Can some one help me with this? Thx in advance!