René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"stream/iter: pipeTo retries accepted PushWriter writes under block backpressure","articleBody":"### Version\n\n26.1.0\n\n### Platform\n\n```text\nmacOS 26.5.0\n```\n\n### Subsystem\n\nstream\n\n### What steps will reproduce the bug?\n\n```js\nimport { pipeTo, push, text } from \"node:stream/iter\";\n\nconst enc = new TextEncoder();\n\nasync function repro(source) {\n  const { writer, readable } = push({\n    highWaterMark: 1,\n    backpressure: \"block\",\n  });\n\n  const piping = pipeTo(source(), writer);\n\n  // Let pipeTo() fill the PushWriter queue before the reader drains it.\n  await new Promise(setImmediate);\n\n  const output = await text(readable);\n  await piping;\n  return output;\n}\n\nasync function* writevSource() {\n  yield [enc.encode(\"ab\")];\n  yield [enc.encode(\"c\"), enc.encode(\"d\")];\n}\n\nasync function* writeSource() {\n  yield [enc.encode(\"a\")];\n  yield [enc.encode(\"b\")];\n}\n\nconsole.log(await repro(writevSource)); // actual: abcdcd, expected: abcd\nconsole.log(await repro(writeSource)); // actual: abbb, expected: ab\n```\n\nRun with\n```console\nnode --experimental-stream-iter repro.js\n```\n\n### How often does it reproduce? Is there a required condition?\n\nAlways\n\n### What is the expected behavior? Why is that the expected behavior?\n\n```\nabcd\nab\n```\n\n### What do you see instead?\n\n```\nabcdcd\nabbb\n```\n\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/trivikr","@type":"Person","name":"trivikr"},"datePublished":"2026-05-14T02:04:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/63296/node/issues/63296"}