Not sure exactly where it changed.
             buf[key] = self.loadtagged(fp, tag)
 
     def makeobjtype(self, nm):
-        return data.namedtype(str(nm), (data.obj, object), {}, typename=nm)
+        return data.namedtype.make(str(nm), (data.obj, object), {}, typename=nm)
 
     def loadobj(self, fp, ref=False):
         if ref:
 
         self.typename = typename
         return self
 
+    @classmethod
+    def make(cls, *args, typename=None, **kwargs):
+        self = cls(*args, **kwargs)
+        self.typename = typename
+        return self
+
 class obj(object):
     def __getitem__(self, key):
         return self.__dict__[key]