XOR override for JexlEngine

public class FullMath extends org.apache.commons.jexl2.JexlArithmetic {
    public FullMath(boolean lenient) {
        super(lenient);
    }

    public Object bitwiseXor(Object left, Object right) {
        double l = toDouble(left);
        double r = toDouble(right);
        return Math.pow(l, r);
    }
}