I didn't spell it out adequately, only implied it, but I am talking about a fully loaded List, not one that just barely works, e.g., it has filter, it has all t

I didn't spell it out adequately, only implied it, but I am talking about a fully loaded List, not one that just barely works, e.g., it has filter, it has all the other things you'd expect from a List. I did discuss the "just barely works" case at the end. It would be an odd "object oriented language" list that lacked such things, e.g., https://docs.oracle.com/javase/8/docs/api/java/util/List.html#remove-int- https://docs.oracle.com/javase/8/docs/api/java/util/List.htm... . We're in OO land here, not FP land.