Can't resolve metadata due to cross-domain composition

Question

Hi,

Let's say I create new composition container in main appdomain and add there an instance of Class1. Then i create Class2 in another app-domain and try to composite it. 

When my exports have no metadata - all works fine. 

[Export(typeof(IClass1))]
public class Class1 : MarshalByRefObject, IClass1 
{ 
    // ... 
}

public class Class2 : MarshalByRefObject
{
    [ImportMany] IEnumerable<Lazy<IClass1>> Classes1 { get; set; }
    // ... 
}

But when i add some metadata to it i get exception that metadata can't be passed via app domain bounds since it is not marked as [Serializable]. 

[Export(typeof(IClass1))]
public class Class1 : MarshalByRefObject, IClass1 
{ 
    // ... 
}

public class Class2 : MarshalByRefObject
{
    [ImportMany] IEnumerable<Lazy<IClass1, IMetadata>> Classes1 { get; set; }
    // ... 
}

AFAIK, Metadata is just dictionary which is not serializable - that's why it happens. 

It would be nice to fix that in the next release