DatasetFactory.createGeneral()

[Adam Jacobs]

I've noticed a couple of differences between DatasetFactory.create() and 
DatasetFactory.createGeneral().
My understanding is that the former is intended to create deep copies of its 
graphs whereas the latter maintains shallow links.
The DatasetFactory has quite a few creational methods, and their documentation 
tends to be brief; but a couple of behaviors stood out to me.

     1. In the general dataset, containsNamedModel() always returns false for 
the default graph.
          This seems unexpected whether from the perspective of copies or links.
     2. In the general dataset, addNamedModel() appears to perform the same 
function as replaceNamedModel().
          This is understandable for simplicity; but from the memory dataset 
perspective, a combined view of identically-named graphs would be expected.
          ~ Fun with words: can we say that "identically-named graphs" are 
homonymous?  ;) ~

Following is some code demonstrating the two points above. Are these behaviors 
intentional?

    public static void main(String... args) {
        Model m1 = ModelFactory.createDefaultModel();
        m1.add(m1.createResource(), m1.createProperty("foo"), 
m1.createResource());
        Model m2 = ModelFactory.createDefaultModel();
        m2.add(m2.createResource(), m2.createProperty("bar"), 
m2.createResource());

        Dataset memory = DatasetFactory.create();
        Dataset general = DatasetFactory.createGeneral();

        memory.getDefaultModel().add(m1);
        general.getDefaultModel().add(m1);
        memory.addNamedModel("bar", m2);
        general.addNamedModel("bar", m2);

        //Memory model contains default graph. General model does not.
        
System.out.println(memory.containsNamedModel(Quad.defaultGraphIRI.getURI()));  
//true
        
System.out.println(general.containsNamedModel(Quad.defaultGraphIRI.getURI()));  
//false

        memory.addNamedModel("bar", ModelFactory.createDefaultModel());
        general.addNamedModel("bar", ModelFactory.createDefaultModel());

        //Memory model add == merge. General model add == replace.
        System.out.println(memory.getNamedModel("bar"));  //merge
        System.out.println(general.getNamedModel("bar"));  //replace
    }