Why can an object not #becomeForward to a SmallInteger? The primitive fails.

A SmallInteger's value is stored in the actual pointer. It makes them a 
special case, but the abstraction is surprisingly water-tight :-)!

I don't see any reason why this primitive can't succeed with this case. 
Just carve out the object reference and stick a SmallInteger there, or 
vice versa. Is there something obvious that I'm missing?

Mikevdg.