OK this is important. So read it carefully.

This checkin implements route matching of comments so that they are only accepted from the same route as the top-level post they are attached to. This way there should be no mis-match of permissions between any posts in the thread. It may not be completely compatible with comments posted in the past (though I've tried to be, there may be some minor issues). In addition it seems that relaying was invoked more often than necessary - especially when a duplicate post arrived which was not processed because the edited time hadn't changed - it still invoked relaying. This fix should improve site performance considerably for comments cross-posted to forums; which got bounced around a bit and delivered redundantly for no reason.

Roll this back *only* if it causes a meltdown or comment loss is "serious" (as in OMG people are dying, make it stop!). If we can get past 24 hours without serious issue we need to get everybody onto this code. There may be some minor comment loss (mostly affecting new comments to older posts or likes of older comments) until the majority of sites have moved to the new code.

It may be difficult or impossible to deliver comments to posts that pre-date the addition of source routes (April 1, 2014) to anybody but the top-level post author at his/her primary hub. We may wish to close comments on these posts, but let's see how we go before doing that.

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