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Interesting post! Puzzles very much like these have devrin me to the view that the best course is to recognize identity statements as being of a sui generis logical form. I have a paper defending this radical view, together with arguments against both the orthodox relational view and the metalinguistic view: .By the way, one of my former teachers does in fact hold a (slightly sophisticated) coreference/metalinguistic account of identity! Arguments with that teacher gave rise to my view.