[colin_jack]

I would just think default iterators are a sensible default especially for maps and that getting them in would be worth the very slight pain it might cause people wanting to attach custom iterators.

[BrendanEich]

Maps have a default iterator as shown in my slides. Sets too.

Best to take this to es-discuss. For now, we're sticking with Python, which did not give its top-class (non-dict) Object a default iterator.