[blankaccount]

I really like your summary of the situation. I'd add that the author seems to have tried to fix a functional readability problem with OO techniques, ending up with the same kingdom of nouns problem - the worst of both worlds.

I think the functional solution would be to separate increment and transform: Stream.iterate(0, i -> i + 1).map(i -> new Pair(i, Math.Pow(i, 2));