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• A type guard of the form expr1 || expr2 o when true, narrows the type of x to T1 | T2, where T1 is the type of x narrowed by expr1 when true, and T2 is the type of x narrowed by expr1 when false and then by expr2 when true, or o when false, narrows the type of x by expr1 when false and then by expr2 when false.