the AC passed to CreateIteratorFromClosure should return completions

spec.html

@@ -46760,10 +46760,10 @@ <h1>Iterator.prototype.drop ( _limit_ )</h1>
               1. If _remaining_ ≠ +∞, then
                 1. Set _remaining_ to _remaining_ - 1.
               1. Let _next_ be ? IteratorStep(_iterated_).
-              1. If _next_ is ~done~, return ~unused~.
+              1. If _next_ is ~done~, return NormalCompletion(~unused~).
             1. Repeat,
               1. Let _value_ be ? IteratorStepValue(_iterated_).
-              1. If _value_ is ~done~, return ~unused~.
+              1. If _value_ is ~done~, return NormalCompletion(~unused~).
               1. Let _completion_ be Completion(Yield(_value_)).
               1. IfAbruptCloseIterator(_completion_, _iterated_).
           1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterator]] »).
@@ -46803,7 +46803,7 @@ <h1>Iterator.prototype.filter ( _predicate_ )</h1>
             1. Let _counter_ be 0.
             1. Repeat,
               1. Let _value_ be ? IteratorStepValue(_iterated_).
-              1. If _value_ is ~done~, return ~unused~.
+              1. If _value_ is ~done~, return NormalCompletion(~unused~).
               1. Let _selected_ be Completion(Call(_predicate_, *undefined*, « _value_, 𝔽(_counter_) »)).
               1. IfAbruptCloseIterator(_selected_, _iterated_).
               1. If ToBoolean(_selected_) is *true*, then
@@ -46847,7 +46847,7 @@ <h1>Iterator.prototype.flatMap ( _mapper_ )</h1>
             1. Let _counter_ be 0.
             1. Repeat,
               1. Let _value_ be ? IteratorStepValue(_iterated_).
-              1. If _value_ is ~done~, return ~unused~.
+              1. If _value_ is ~done~, return NormalCompletion(~unused~).
               1. Let _mapped_ be Completion(Call(_mapper_, *undefined*, « _value_, 𝔽(_counter_) »)).
               1. IfAbruptCloseIterator(_mapped_, _iterated_).
               1. Let _innerIterator_ be Completion(GetIteratorFlattenable(_mapped_, ~reject-primitives~)).
@@ -46901,7 +46901,7 @@ <h1>Iterator.prototype.map ( _mapper_ )</h1>
             1. Let _counter_ be 0.
             1. Repeat,
               1. Let _value_ be ? IteratorStepValue(_iterated_).
-              1. If _value_ is ~done~, return ~unused~.
+              1. If _value_ is ~done~, return NormalCompletion(~unused~).
               1. Let _mapped_ be Completion(Call(_mapper_, *undefined*, « _value_, 𝔽(_counter_) »)).
               1. IfAbruptCloseIterator(_mapped_, _iterated_).
               1. Let _completion_ be Completion(Yield(_mapped_)).
@@ -46976,7 +46976,7 @@ <h1>Iterator.prototype.take ( _limit_ )</h1>
               1. If _remaining_ ≠ +∞, then
                 1. Set _remaining_ to _remaining_ - 1.
               1. Let _value_ be ? IteratorStepValue(_iterated_).
-              1. If _value_ is ~done~, return ~unused~.
+              1. If _value_ is ~done~, return NormalCompletion(~unused~).
               1. Let _completion_ be Completion(Yield(_value_)).
               1. IfAbruptCloseIterator(_completion_, _iterated_).
           1. Let _result_ be CreateIteratorFromClosure(_closure_, *"Iterator Helper"*, %IteratorHelperPrototype%, « [[UnderlyingIterator]] »).