object.factory with template classes for serializing subclasses automatically

[timotheecour]

Is there a way to use Object.factory with template classes?
eg:
----
class A(T){
     T x;
}
auto a=Object.factory("A!int");
----
Right now this fails (returns null).

Use case:
If we had this, it would GREATLY simplify serialization (eg as in 
the orange library) by not having to manually register subclasses 
of a given class, eg:
class B{}
class C:B{int x;}
B c=new C;
right now with orange, we need to register class C before calling 
serialization. If something like Object.factory("A!int") worked, 
this step could be made automatic.