[sv-ec] are constraints virtual like?

Please see the below code. I'm using constraints mode on a handle of base
class type pointing to child class. (there are constraints with same name in
base and child class)
My question is how it should behave.. Should it turn off only the constraint
from base class or both constraints or should it behave virtual like and
turn of child class constraint?
 
class C;
    rand int a;
    constraint con1{a==0;}
endclass

class D extends C;
    constraint con1{a==10;}
endclass

module top;
    C c;
    D d = new;
    initial begin
        c = d;
        c.con1.constraint_mode(0);
        
        c.randomize();
        $display(c.a);
                      
        d.randomize();
        $display(c.a);
    end
    
endmodule

 
DANiel

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