I still don’t understand why they’re referred to as persistent vectors rather than immutable vectors, but I digress.

I believe that immutable just means, well, immutable, but persistent means that updates are achieved via structural sharing, so they’re efficient.

structural sharing = log n updates

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)