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A ModelPropertyValueComparator that checks whether property values being compared use the Comparable interface, and if not compares them using their string values.

<M> The Model object type
Creates a new ModelPropertyValueComparator.

propertyExpression the expression that extracts the property from the model object
    public DefaultModelPropertyValueComparator(String propertyExpression) {
        super(propertyExpressionnew Comparator<Object>() {
            public int compare(Object o1Object o2) {
                if (o1 instanceof Comparable) {
                    return ((Comparableo1).compareTo(o2);
                } else {
                    return String.valueOf(o1).compareTo(String.valueOf(o2));
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