"Huge Appetite" acheivement not awarding

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I've been playing a wyrmic who's been using Swallow on pretty much everything, and I haven't earned any points towards Huge Appetite (even on random bosses who aren't immune to the autokill aspects). Looking at achievements/kills.lua, it looks like it's comparing "who.rank" to 35 (thirty-five) rather than 3.5 (three-point-five).