René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incorrect result from isDeepStrictEqual on two different Sets","articleBody":"### Version\n\n22.21.1\n\n### Platform\n\n```text\nMicrosoft Windows NT 10.0.19045.0 x64\n```\n\n### Subsystem\n\nutil\n\n### What steps will reproduce the bug?\n\nThe problem can be seen in a quick REPL session:\n\n\u003e Welcome to Node.js v22.21.1.\n\u003e Type \".help\" for more information.\n\u003e \\\u003e a = new Set([0, new Set([1, 2, 3]), new Set([4, 5, 6])])\n\u003e Set(3) { 0, Set(3) { 1, 2, 3 }, Set(3) { 4, 5, 6 } }\n\u003e \\\u003e b = new Set([0, new Set([1, new Set([2, 3]), new Set([20, 30])]), new Set([4, new Set([5, 6]), new Set([50, 60])])])\n\u003e Set(3) {\n\u003e   0,\n\u003e   Set(3) { 1, Set(2) { 2, 3 }, Set(2) { 20, 30 } },\n\u003e   Set(3) { 4, Set(2) { 5, 6 }, Set(2) { 50, 60 } }\n\u003e }\n\u003e \\\u003e require('util').isDeepStrictEqual(a, b)\n\u003e true\n\n\n### How often does it reproduce? Is there a required condition?\n\nInterestingly, `require('util').isDeepStrictEqual(b, a)` returns false, as expected. Which indicates that isDeepStrictEqual is not symmetrical.\n\n### What is the expected behavior? Why is that the expected behavior?\n\nThe result should be false.\n\n### What do you see instead?\n\nI'm seeing true.\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/DoubleClickPreferred","@type":"Person","name":"DoubleClickPreferred"},"datePublished":"2026-01-14T19:24:10.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/61386/node/issues/61386"}