[whatwg/streams] Assert that async iterator's reader is always active (PR #1247)

Fixes #1246.

I suppose this is mostly editorial? The behavior shouldn't change, since this check would never have triggered in practice.

- [ ] At least two implementers are interested (and none opposed):
   * …
   * …
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * …
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: …
   * Gecko: …
   * WebKit: …
   * Deno: …
   * Node.js: …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1247


-- Commit Summary --

  * Assert that async iterator's reader is always active

-- File Changes --

    M index.bs (6)
    M reference-implementation/lib/ReadableStream-impl.js (11)

-- Patch Links --

https://github.com/whatwg/streams/pull/1247.patch

https://github.com/whatwg/streams/pull/1247.diff


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