Re: [whatwg/streams] ReadableStream.from(asyncIterable) (#1083)

@MattiasBuelens commented on this pull request.



> + 1. Let |startAlgorithm| be the following steps:
+  1. Set |iteratorRecord| to ? [$GetIterator$](|asyncIterable|, async).
+ 1. Let |pullAlgorithm| be the following steps:
+  1. Let |nextResult| be [$IteratorNext$](|iteratorRecord|).
+  1. If |nextResult| is an abrupt completion, return [=a promise rejected with=]
+     |nextResult|.\[[Value]].
+  1. Let |nextPromise| be [=a promise resolved with=] |nextResult|.\[[Value]].
+  1. Return the result of [=reacting=] to |nextPromise| with the following fulfillment steps,
+     given the argument |iterResult|:
+   1. If [$Type$](|iterResult|) is not Object, throw a {{TypeError}}.
+   1. Let |done| be ? [$IteratorComplete$](|iterResult|).
+   1. If |done| is true:
+    1. Perform ! [$ReadableStreamDefaultControllerClose$](stream.[=ReadableStream/[[controller]]=]).
+   1. Otherwise:
+    1. Let |value| be ? [$IteratorValue$](|iterResult|).
+    1. Perform ! [$ReadableStreamDefaultControllerEnqueue$](stream.[=ReadableStream/[[controller]]=],

No, there shouldn't be. But when we decide to add such extension in the future, we mustn't forget to turn this `!` into a `?` and handle the error (by closing the iterator).

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