Sure, but the point remains: If you fight the operating system you WILL lose. Varnish doesn’t solve the same problem as Squid does, the author have said as much in talks when Varnish was first released. Still that doesn’t excuse an outdated programming model in Squid.

We actually do have a persistent `stevedore` in Varnish Cache, but we have marked it "deprecated" because it did not live up to expectations, but we keep it around to keep the internal API's honest.

Redesigning that code has not bubbled up to the top of my TODO list yet, and shows now signs of doing so.

But if you need persistence, there is a commercial version of Varnish which has it, but I have not been involved in that.