core/src/main/java/org/apache/commons/functor/aggregator/functions/DoubleSumAggregatorBinaryFunction.java [39:47]:
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    public Double evaluate(Double left, Double right) {
        if (left == null) {
            return right;
        }
        if (right == null) {
            return left;
        }
        return left + right;
    }
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core/src/main/java/org/apache/commons/functor/aggregator/functions/IntegerSumAggregatorBinaryFunction.java [39:47]:
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    public Integer evaluate(Integer left, Integer right) {
        if (left == null) {
            return right;
        }
        if (right == null) {
            return left;
        }
        return left + right;
    }
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