Comment 7 for bug 604620

So there are two things here:
 - should clients be able to force squid to go back to the librarian
 - do we care about consistency when an item is just added/deleted in the librarian.

For the former, no, clients don't ever need to force a refresh from the librarian - the content is immutable, and we want squid to be authoritative. Contrast this with dynamic content where there is more of an argument that clients should be able to say 'hey, I know better'.

For the latter, we tolerate some slack on deletes. Were we to particularly worry about some content vanishing instantly, we could start using PURGE. For adds, we put the content in the librarian before handing out URLs, so negative misses are not an issue for us.

With the above in mind, I'm closing this as wont fix.