Re: [whatwg/fetch] Fail request when its streaming body is used in ServiceWorker (#1144)

@annevk commented on this pull request.



> @@ -3834,9 +3834,32 @@ optional <i>CORS-preflight flag</i>, run these steps:
   <p>If <var>request</var>'s <a>service-workers mode</a> is "<code>all</code>", then:
 
   <ol>
+   <li><p>Assert: <var>request</var> 's <a for=request>body</a> is either null or a
+   <a for=/>body</a>.
+
+   <li>
+    <p>Let <var>savedBody</var> be a copy of <var>request</var>'s <a for=request>body</a>.

```js
const req = new Request("about:blank", { method: "POST", body: rs });
fetch(req);
req.text();
```
What causes the last line to throw? As far as I can tell `fetch()` doesn't obtain the reader for _rs_ until way too late.

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