Update: Actually the documentation was more imprecise than incorrect: what it meant to say was that, even with versioned resources enabled, resources served by the PFC did not get an expiration date set far in the future. Note that with versioned resources (available in the PE version), resource URLs include a version number and are aggressively cached, so that in effect they "never" expire from the browser (of course the browser can still expire them any time it wants based on cache settings). The relevant source code is in ResourceServer.java, XFormsResourceServer.java, and ServletExternalContext.java. It seems that the documentation is incorrect, as I see that the code uses the standard HTTP heuristic of the "age of the resource plus 10%".
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