Default values in derived class

[JN via Digitalmars-d-learn]

import std.stdio;

class Base
{
    bool b = true;
}

class Derived : Base
{
    bool b = false;
}

void main()
{
// 1
    Base b = new Derived();
    writeln(b.b); // true
// 2
    Derived d = new Derived();
    writeln(d.b); // false
}


Expected behavior or bug? 1) seems like a bug to me.