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Development of Lua support for both Template:Cs1 and Template:Cs2 began at Module:Citation. That development was abandoned in 2013 as development of wikipedia:Module:Citation/CS1 began.
Though this module remained unused, it is and has been the root page of the several module subpages that implement cs1 and cs2. The content of this module was replaced with an error message return as the result of a 2018 TfD.