The attached patch adds a method ".duplicate" to rinterface.Sexp objects. When called, it returns a new Sexp that is identical to the first, but shares no memory with the first. (Underlyingly, it just calls Rf_duplicate.)
This is useful when you have an Sexp that you want to mutate, but you also want to correctly preserve R's copy-on-write semantics. Tests are included, and pass for me. -- Nathaniel
NEW_expose_Rf_duplicate
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