“Hidden” from whom and how? “Same fields in beginning” doesn’t characterize multiple inheritance. “Tagged structs” are just one implementation strategy for one

“Hidden” from whom and how? “Same fields in beginning” doesn’t characterize multiple inheritance. “Tagged structs” are just one implementation strategy for one kind of polymorphism, and “tagged” and “struct” are themselves jargon. Using and knowing the precise terminology is important when communicating technical concepts.