[puzpuzpuz-hn]

Thanks. There are downsides in each approach, e.g. if you care about minimal allocation rate, you should go with plain map + RWMutex. So yeah, no silver bullet.

[vanderZwan]

There almost never is. The fact that you acknowledge it and give context only would make me more confident in trying out your library, or any of the other listed (if I wrote Go code, that is).