Autofixture customizations: provide constructor parameter

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As answered here you can have something like

public class FooArg : ISpecimenBuilder
{
    private readonly string value;

    public FooArg(string value)
    {
        this.value = value;
    }

    public object Create(object request, ISpecimenContext context)
    {
        var pi = request as ParameterInfo;
        if (pi == null)
            return new NoSpecimen(request);

        if (pi.Member.DeclaringType != typeof(Foo) ||
            pi.ParameterType != typeof(string) ||
            pi.Name != "str2")
            return new NoSpecimen(request);

        return value;
    }
}

and then you can register it like this

var fixture = new Fixture();
fixture.Customizations.Add(new FooArg(knownValue));

var sut = fixture.Create<Foo>();

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