> A new concern from me is that this change would allow Iterable and > Stream to be used in foreach, but not Iterator. This seems like an > odd/sharp conceptual edge.
Not actually a new concern — this was discussed back in JSR 335 as well. > Why not make `Iterator` implement `IterableOnce`? The default method > would obviously just return `this`. Such a default would not conform to the contract, as IO requires that subsequent calls throw.
