If you talk nice to Otis, he might make that method virtual for you in the shipping templates. :-)
Already did talk to him . Anyway it is not a big deal and you usually won't need (de)serialization - except when looking at (Rh)ResultsetFields through debugger visualizer I am going to present shortly. Oops, talking too much
It's virtual in the templates which arent for backwards compatibility. So you have to move the 'backwardscompatibility' templatebinding to the bottom of the list.