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Wouldn't it be nice if Hacker news discovered when this happens on its own, possibly preventing the link to be created or auto-linking to old/related posts?

• user24 16y ago
  People could still use the old ?resubmit=true tacked on the end to bypass that. But yes, it would be nice.
• wanderr 16y ago
  I thought HN did do that checking. Sorry.