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

Inizia in lib/internal/streams/readable.js, in Readable[Symbol.asyncIterator], e verifica come readable.iterator() consuma attualmente lo stream. Confronta il comportamento proposto di data-event con l’esempio fornito di iterazione concorrente; completato significa che è definita un’opzione e che più lettori ricevono ogni chunk come documentato.