Deadlock when using `operator>` on a stream that emits more than 16KiB

[Goodwine]

Context: https://gist.github.com/nex3/4aee4b681ffddf6480ea20dc75f8ad26

#50

    test("does not block with a large chunk of data", () async {
      var payloadSize = (1 << 16) + 1;
      // This must be an actual script. [Script.capture] won't fail.
      var script = mainScript('stderr.write("." * $payloadSize);');
      var controller = StreamController<List<int>>();
      script.stderr > controller.sink;

      await script.done;

      expect((await controller.stream.text).length, payloadSize);
    }, timeout: Timeout(Duration(seconds: 3)));

The issue comes from dart core libraries and is not cli_script-specific. However this may be considered WAI by Dart so it should be handled automatically.

I was able to repro with Process and Script.fromBytesBufferTransformer. However, the latter doesn't require a full payload so maybe each blocks for different reasons 🤔

[Goodwine]

This is WAI in that the operator> simply forwards to pipe(...) and it should not concern itself with this problem.