there's an exception when key is greater than 127

[gongchangyou]

    for (int i = 0; i < 1000; i++) {
        Value k = new Value(i);
        btree.addValue(k, i);

}

    IndexConditionBW bw = new IndexConditionBW(new Value(100), new Value(128));

btree.search(bw, callback) will throw exception

            throw new IllegalStateException("range scan failed... bug?");