If I took a list, I'd have to make and store a copy of its contents. It would be expensive, and it would not see subsequent changes to the original array. I wanted a lightweight iterator tied to a user-modifiable array.
The user can create an anonymous array and slap an iterator on it, if he so desires: array_iterator(@{[1..10]}). That makes it obvious that this iterator can't give you the free lunch that for (1..10) does.
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