Summary

when i read a mongo struct from mongodb, then process some filed, marshal to bytes, then store to cache.

when  other scenes, get bytes from cache, then unmarshal it , it is not work.

like this: 

unmarshal error document is invalid, end byte is at 28, but null byte found at 21

Please provide the version of the driver. If applicable, please provide the MongoDB server version and topology (standalone, replica set, or sharded cluster).

the latest  version  v1.12.0 still has the same bug

How to Reproduce

type P struct

func TestMismatch(t *testing.T)

)
  if err != nil

  var p P
  err = bson.Unmarshal(bytes, &p)
  if err != nil

}

Additional Background