@@ -0,0 +1,473 @@
+package com.alibaba.json.bvt.issue_1100;%0A%0Aimport com.alibaba.fastjson.JSON;%0Aimport junit.framework.TestCase;%0A%0A/**%0A * Created by wenshao on 27/04/2017.%0A */%0Apublic class Issue1165 extends TestCase %7B%0A    public void test_for_issue() throws Exception %7B%0A        Model model = new Model();%0A        model.__v = 3;%0A%0A        String json = JSON.toJSONString(model);%0A        assertEquals(%22%7B%5C%22__v%5C%22:3%7D%22, json);%0A    %7D%0A%0A    public static class Model %7B%0A        public Number __v;%0A    %7D%0A%7D%0A

add testcase for issue #1165