Quick fix "Unknown or expired link."
If I remember correctly, the issue is that the order is remembered on the server side for each session.
But the order is (about) the same for each request coming in the same second. Or 10 seconds. Or 1 minute. Really, who cares for 1 minute inaccuracy in the order?
HN could reuse the ordering and simply give the users the current timestamp rounded down to seconds (or 10sec or 1min) as the "fnid".
This way there were much less orderings so they could be kept in memory for much longer.
(Sorry if I remembered wrongly and missed the point.)
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