Method normaliseStringType

src/main/java/groovy/lang/ObjectRange.java:578–590

if operand is a Character or a String with one character, return that character's int value.

(final Comparable operand)

     * if operand is a Character or a String with one character, return that character's int value.
     */
    private static Comparable normaliseStringType(final Comparable operand) {
        if (operand instanceof Character) {
            return (int) (Character) operand;
        }
        if (operand instanceof String string) {

            if (string.length() == 1) {
                return (int) string.charAt(0);
            }
            return string;
        }
        return operand;
    }
}