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Refactor const ref args in Node classes ctors and setters. #163
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During work on
Node
classes, I replaced many constant reference arguments with by-value arguments. This is because constructors and setters are going to store them in the object anyway, so using by-value arguments allows a caller to avoid a copy if he decides to move-create or emplace-create arguments (he has no such option with constant reference arguments).Some constant reference cases were missed and move-construction is not always used. This minor refactoring fixes that.