Autofixture question

example.cs

public class TestClass
{
  public void Test1()
  {
    var fixture = new Fixture();

    // This doesn't let me pass 42?
    sut.Freeze<int>("importantNumber");

    var sut = fixture.CreateAnonymous<ToBeInstantiated>();

    sut.Magic.ShouldBeTrue();
  }

  public class ToBeInstantiated
  {
    public class ToBeInstantiated(int someNumber, int importantNumber)
    {
       // Magic happens depending on value of importantNumber
       Magic = importantNumber == 42;
    }

    public bool Magic { get; private set; }
  }
}