Broken boolean expression evaluation in version 3.1.0

[Adler95]

With version 3.1.0, the boolean expression evaluation was broken. It seems that the problem takes effect only when scale of the BigDecimal is greater than zero.

Example (correct result) with scale 0:

        Expression expression = new Expression("a && b");

        EvaluationValue result = expression
                .with("a", BigDecimal.ZERO)
                .and("b", BigDecimal.ZERO)
                .evaluate();

        System.out.println(result.getBooleanValue()); // prints false

Example (wrong result) with scale 1:

        Expression expression = new Expression("a && b");

        EvaluationValue result = expression
                .with("a", new BigDecimal("0.0"))
                .and("b", new BigDecimal("0.0"))
                .evaluate();

        System.out.println(result.getBooleanValue()); // prints true