func isNonNullableNonDefaultableNull(x interface{}, s *structuralschema.Structural) bool {
	return x == nil && s != nil && s.Generic.Nullable == false && s.Default.Object == nil
}

func getSchemaForField(field string, s *structuralschema.Structural) *structuralschema.Structural {
	if s == nil {
		return nil
	}
	schema, ok := s.Properties[field]
	if ok {
		return &schema
	}
	if s.AdditionalProperties != nil {