Iterator (vec/map unpacker)

[emil14]

Iterator

Component that takes "iterable" data structure and turns it into a sub-stream.

What about array ports?

[emil14]

Separate

mapIterator<K, V>(v map<K, V>) (pair SubStream<{k, v}>)

or

mapIterator<K, V>(v map<K, V>) (k SubStream<K>, v SubStream<V>)

and

vecIterator<T>(v vec<T>) (v SubStream<V>, i SubStream<int>)