The most significant impact of this change is that fields whose types are type parameters should now GSONify just fine. For example, consider the class below.
abstract class Foo<A, B> {
A a;
B b;
List<A> list;
Map<A, List<B>> map;
}
class RealFoo extends Foo<String, Integer> {...}
This is a reasonable checkpoint but some work still needs to be done for this. In particular, the level of visibility of methods in TypeToken and Type should be reconsidered; we're exposing more than we need to!