existing bug in cedar

[bingle123]

there was a bug in cedar; when I test cedar in 10,000,000 random keys(5~20 random key length), there always has some keys gave a error integer value(compare with mapstd::string,int32_t). I has rewrite cedar logic in my own project, and got the same error. I've debugged my project, I found it is that the logic error occur when update some existing key's new value.