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Thanks for the contribution! However, I have a lot of questions design-wise. What you implemented seems unnecessarily restrictive to me: Users have to enter a list of either exclusively strings or ints, and then tell the function in a separate parameter whether they entered strings or ints 😬 Also, the enum doubles functionality with country_to_iso, which allows for converting numerical to alpha-3 ISO codes and vice versa.

Overall, the function/enum combination can be made much more accessible and concise, I think.