There are a lot of long-running perl scripts especially in the CGI area that depend on not using up more and more memory. But generally you have to do really dirty things to get bit by this. So the information is useful although probably not FAQ-worthy, especially not in this detail. And I had problems with understanding it on first reading too
The most useful information in my opinion is "There is no guarantee that your perl version will give back memory to the system"
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