Global constraints with validators override local defined validator constraints

When a global constraint is used via 'share' and it defines a custom validator then the local validator constraint of the object referencing the shared constraint is never called (overriden).

This behavior is not clear and there should be either a warning or the possibility to have a local and a global validator constraint side by side.

grails.gorm.default.constraints = {
    myConstraint(validator: { String value, object ->

    })
}

class User {

    String username

    static constraints = {
        username(shared: 'myConstraint', validator: { String value, object ->
            // never called
        })
    }
}

Maybe the global constraints can be more isolated to not affect the local constraints. This may lead to other problems regarding the schema generation.