Re: [streams] Change the model for ReadableStream to have async read() (#288)

> -        } else if (ds === 'waiting') {
> -          if (source.state === 'readable') {
> -            Promise.race([source.closed, dest.ready]).then(doPipe, doPipe);
> -          } else if (source.state === 'waiting') {
> -            Promise.race([source.ready, dest.ready]).then(doPipe);
> -          } else if (source.state === 'errored') {
> -            source.closed.catch(abortDest);
> -          } else if (source.state === 'closed') {
> -            closeDest();
> -          }
> -        } else if (ds === 'errored' && (source.state === 'readable' || source.state === 'waiting')) {
> -          dest.closed.catch(cancelSource);
> -        } else if ((ds === 'closing' || ds === 'closed') &&
> -            (source.state === 'readable' || source.state === 'waiting')) {
> -          cancelSource(new TypeError('destination is closing or closed and cannot be piped to anymore'));
> +      Promise.all([source.read(), dest.ready]).then(([chunk]) => {

Hmm. I guess in that case we will just keep doing `dest.write()` and ignoring the fact that it fails. That is indeed silly and so we should not do it. But it at least explains why no tests were failing.

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