@lsmith77 could you help me figure out how this actually works? right now i don't see the point of this:

* at the response sending time, the flash messages are already rendered into the content, or not? ah, or does this mean we MUST not ever render flash messages in twig when using this?
* this will make the response contain a Set-Cookie header. will this not make varnish skip caching the response? or do you have a vcl sample how this works?