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Traditionally, you can join two strings with the operator + in almost every modern programming language, and there is no reason for that. Concatenation has very little in common with addition, and there is no need to merge together two separate operations. Addition is commutative: 1 + 2 == 2 + 1. Concatenation is not: "a" .. "b" != "b" .. "a". Addition has the inverse operation -, concatenation does not. Considering only the primitive types, you can add only the numbers (and maybe booleans), bu...