stream/iter: writer.fail(0) can leave async iterator readers pending forever

[trivikr]

Version

26.2.0

Platform

macOS 26.5.0

Subsystem

stream

What steps will reproduce the bug?

import { push } from 'node:stream/iter';
import { setTimeout } from 'node:timers/promises';

const { writer, readable } = push();
const reader = readable[Symbol.asyncIterator]();

writer.fail(0);

const result = await Promise.race([
  reader.next().then(
    (value) => ({ type: 'settled', value }),
    (reason) => ({ type: 'rejected', reason }),
  ),
  setTimeout(100, { type: 'timeout' }),
]);

console.log(result);

How often does it reproduce? Is there a required condition?

Always

What is the expected behavior? Why is that the expected behavior?

{ type: 'rejected', reason: 0 }

next() should reject with the stored failure reason, including falsy values such as 0 or false, because fail(reason) accepts any value.

What do you see instead?

{ type: 'timeout' }

After calling writer.fail(0), a subsequent readable[Symbol.asyncIterator]().next() does not settle and the repro times out.

Additional information

No response