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You can pass these reserved traits using camelCase or snake_case, so in JavaScript you can match the rest of your camel-case code by sending firstName, while in Ruby you can match your snake-case code by sending first_name. That way the API never seems alien to your code base. Keep in mind that not all destinations support these reserved traits, so sending these traits in camelCase and snake_case can result in two sets of traits in other destinations.
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