Re: [streams] Convert readable stream pull() to promise-returning (#272)

> +    }
> +  });
> +
> +  t.equal(rs.state, 'waiting', 'stream starts out waiting');
> +
> +  rs.ready.then(() => {
> +    t.equal(rs.state, 'readable', 'stream becomes readable (even before promise fulfills)');
> +    t.equal(timesCalled, 1, 'pull is not yet called a second time');
> +    t.equal(rs.read(), 1, 'read() returns enqueued value');
> +
> +    setTimeout(() => {
> +      t.equal(timesCalled, 1, 'after 30 ms, pull has still only been called once');
> +
> +      resolve();
> +
> +      returnedPromise.then(() => {

looks a little misleading. can't we just use Promise.resolve(undefined).then(...) or setTimeout(..., 0)?

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