I believe that immutable just means, well, immutable, but persistent means that updates are achieved via structural sharing, so they’re efficient.
if you think immutable updates are O(n) in 2026, you're so far behind the curve it's laughable
it's crazy how many ppl i interview just stop thinking and insist you can't do better than O(n)
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I believe that immutable just means, well, immutable, but persistent means that updates are achieved via structural sharing, so they’re efficient.