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can a switch script determine if the case has been used before?

Switch statements normally check against integer values, and an integer value isn't enough information to check if something has been used before. If statements check against boolean values, normally through the use of boolean operators or values that can be implicitly converted into a boolean value. Unfortunately, AngelScript scripting (at least the version that comes with Amnesia) doesn't implicitly convert other data types into boolean values for if statement conditions.