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/**
 * Calculate the sum of two numbers.
 *
 * This function takes two numbers as input and returns their sum.
 *
 * @param float $num1 The first number.
 * @param float $num2 The second number.
 *
 * @return float The sum of $num1 and $num2.
 *
 * @throws InvalidArgumentException If $num1 or $num2 is not a number.
 */