spec: Await next values with default map ƒ

Fixes #19.

Author: js-choi

spec.html

@@ -74,10 +74,10 @@ <h1><ins>Array.fromAsync ( _asyncItems_ [ , _mapfn_ [ , _thisArg_ ] ] )</ins></h
               1. If _mapping_ is *true*, then
                 1. Let _mappedValue_ be Call(_mapfn_, _thisArg_, &laquo; _nextValue_, 𝔽(_k_) &raquo;).
                 1. IfAbruptCloseAsyncIterator(_iteratorRecord_, _mappedValue_).
-                1. Set _mappedValue_ to Await(_mappedValue_).
-                1. IfAbruptCloseAsyncIterator(_iteratorRecord_, _mappedValue_).
-                1. Set _mappedValue_ to _mappedValue_.[[Value]].
               1. Else, let _mappedValue_ be _nextValue_.
+              1. Set _mappedValue_ to Await(_mappedValue_).
+              1. IfAbruptCloseAsyncIterator(_iteratorRecord_, _mappedValue_).
+              1. Set _mappedValue_ to _mappedValue_.[[Value]].
               1. Let _defineStatus_ be CreateDataPropertyOrThrow(_A_, _Pk_, _mappedValue_).
               1. If _defineStatus_ is an abrupt completion, return ? AsyncIteratorClose(_iteratorRecord_, _defineStatus_).
               1. Set _k_ to _k_ + 1.