CRC32 Hash Collision
There is a hash collision in `util.js` -> `hash` method，etc.
```
console.log(crc32(`{"cookie":{"path":"/","httpOnly":true,"maxAge":86400000,"overwrite":true,"signed":true},"userInfo":{"name":"htpqwklvynl","age":18}}`));
console.log(crc32(`{"cookie":{"path":"/","httpOnly":true,"maxAge":86400000,"overwrite":true,"signed":true},"userInfo":{"name":"pojqhnulnxu","age":18}}`));
```
