see: https://gist.github.com/c735292c7757bf4c4562cf04337da038 (from https://github.com/pedestal/pedestal/blob/master/immutant/project.clj, with the org.immutant/web dependency bumped to 2.1.4.
Oddly, setting :pendantic? true in immutant/web/project.clj doesn't show the same issue (and why are we :pendantic? false anyway? It seems like we would want to catch and resolve these kinds of conflicts so our users don't have to).