*            The class. Must not be {@literal null}.
     * @return The wrapper class if the argument is a primitive class, otherwise the class passed as the argument.
     */
    public static Class<?> getWrapperClassIfPrimitive(final Class<?> clazz) {
        assertArgumentNotNull("clazz", clazz);

        final Class<?> ret = getWrapperClass(clazz);
        if (ret != null) {
            return ret;
        }