refreshCheck delta

Hi,

In refreshIsCachable in refresh.cc, you have this line:
     int reason = refreshCheck(entry, NULL, ESI ? 0 : 60);

I read the comment and cannot fathom why the object cannot be refreshed.
   Even if it can't, it seems like we should be able to override this
without modifying the source code and set the delta to 0.

-- 
David Nicklay
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