I see what you mean but think that the docs shouldn't go into how
super() is implemented.  Already, they've reached an information density
such that adding more explanations will make it collectively less clear.
 As soon as you mention proxy objects as inputs, I'm pretty sure that
you've lost most of your readers (including me).  

I think what we've got is enough to help folks begin to understand what
to do even if they can't describe how super() is implemented.