Thanks to everyone for their valuable feedback on this RFC.
Clearly the proposed solution is not adequate, perhaps because
it does not address the central issue that iterators really ought
to be stateful objects, rather than statefree functions.
I don't have time to rework the proposal from scratch, so
the alternatives are:
1. I retract the RFC, and we live with the problem
2. I freeze the RFC, having added an Unresolved Problems section
3. Someone else takes it over and fixes it properly
Preferences? Suggestions? Volunteers?
Damian
