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This module was pretty much undocumented. Fix that. Inspired by a preliminary patch sent by Ramanarayana, heavily updated by Andrew Dunstan, and reviewed by Michael Paquier. Discussion: https://postgr.es/m/CAF6A77G_WJTwBV9SBxCnQfZB09hm1p1O3stZ6eE5QiYd=X84Jg@mail.gmail.com