Method decrement

src/main/java/groovy/lang/ObjectRange.java:571–573

Decrements by one @param value the value to decrement @return the decremented value

(Object value)

     * @return the decremented value
     */
    protected Object decrement(Object value) {
        return InvokerHelper.invokeMethod(value, "previous", null);
    }

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