René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Update `assert.deepStrictEqual` docs to mention `.constructor` property","articleBody":"### Affected URL(s)\n\nhttps://nodejs.org/docs/latest-v24.x/api/assert.html#comparison-details_1\n\n### Description of the problem\n\nI’ve been running into an bug in my code where `assert.deepStrictEqual(a, b)` was throwing unexpectedly.\n\nTo make a long story short, `a` and `b` were instances of a derived class that returned a `new Proxy` object in its constructor. The handler for this proxy set a new `Function.prototype.bind` call on *any* function object from the target, but this accidentally caught the `target.constructor` property in the line of fire — the intent was to only rebind instance methods. Basically, `a` and `b` shared the same prototype, but had unequal `.constructor` properties due to the incorrect binding.\n\nThe docs for `assert.deepStrictEqual` say that only the [[Prototype]] and enumerable own properties are checked, so I was scratching my head trying to track down the bug, meticulously checking my code against the docs point by point. Only by stepping through the Node.JS source code did I see [where `.constructor` is accessed](https://github.com/nodejs/node/blob/v22.20.0/lib/internal/util/comparisons.js#L269). Then I found the new docs for [`util.isDeepStrictEqual`](https://nodejs.org/docs/latest-v24.x/api/util.html#utilisdeepstrictequalval1-val2-options), which in v24 has been updated to mention explicitly that constructors are checked. This would’ve been good to know!\n\nSo this issue is a request to update the `assert.deepStrictEqual` docs by adding a bullet point stating how object constructors are included in the comparison algorithm. Thank you!","author":{"url":"https://github.com/chharvey","@type":"Person","name":"chharvey"},"datePublished":"2025-10-13T02:14:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/60239/node/issues/60239"}