Is there any advanced doc on writing custom KSerializer ?

Some links here: https://kotlinlang.slack.com/archives/C7A1U5PTM/p1539772487000100?thread_ts=1539772487.000100&cid=C7A1U5PTM

Thanks, in the end I managed to implement it by looking at the implementation of the Triple<A,B,C> Serializer 🙂