Allow multiple readers to iterate over a stream at the same time

What is the problem this feature will solve?

When multiple callers use Readable[Symbol.asyncIterator], each caller receives a partial result.

import {Readable} from 'node:stream'

const stream = Readable.from(['a', 'b', 'c'])

const iterate = async (readerName) => {
  for await (const chunk of stream) {
    console.log(readerName, chunk)
  }
}

await Promise.all([
  iterate('one'),
  iterate('two'),
])

one a
two b
one c

Some callers might expect that result. But others might expect the following result instead.

one a
two a
one b
two b
one c
two c

What is the feature you are proposing to solve the problem?

Adding an option to readable.iterator() to use readable.on('data') instead of readable.read(). This would enable the above behavior.

What alternatives have you considered?

Implementing this user-land.

See an example of it at https://github.com/sindresorhus/get-stream/pull/121

lib/internal/streams/readable.js の Readable[Symbol.asyncIterator] から始め、readable.iterator() が現在どのようにストリームを消費しているかを確認します。提案されている data-event の動作を、提示された並行イテレーションの例と比較します。完了とは、オプションが定義され、複数の読み取り側がドキュメントどおりに各チャンクを受け取ることを意味します。