[Haskell-cafe] Handling custom types in Takusen

Disclaimer: I don't know Takusen very well, and I'm talking of Sqlite backend. I noticed that in Takusen there're just two instances to implement to make any Haskell type db-serializable: DBBind / SqliteBind for serialization and DBType for deserialization. I wanted to implement blob serialization for PackedStrings, but I noticed that both DBBind and DBType classes are not public. Defining custom serialization (not just Show / Read string serialization) is very useful in applicative code, and not just in Takusen backend code. There's any way to do it without modifying Takusen Sqlite backend? Salvatore Insalaco