Not works with interfaces

[rmorrise]

class DomainA {
       IEmbeddedDomain embedded

       static mapper = {
            embedded type: CustomJsonType
       }

       static  constraints = {
            embedded cascade: true // <--- Not works
       }
}

@Validateable
class DomainB implements IEmbeddedDomain {
        String someData 

        static  constraints = {
             someData nullable: false
        }
}

def a = new DomainA(
    embedded: new DomainB()
)
a.validate() // returns true 

(issue reported 10/07/2015 by @gtors)

[virtualdogbert]

While this may not be the cause of the problem @Validateable isn't valid in Grails 3, as we have the Validateable trait...