Major Description
We have the option of serializing custom classes that implement the Tuple interface using the following method on PTypeFamily:
PType<T> tuples(Class<T>, ...)
These classes act somewhat like case classes in Scala, and can be used to give useful semantics to something that would otherwise be a Tuple4<Integer, String, Double, Integer> (or some such thing.) Right now, we have a bug in which the static TupleFactory.getTupleFactory does not recognize these custom classes, and so they can't be used in a nested fashion with the deep copier.