GitLab

* `epgsql` / `epgsqla` / `epgsqli` / copy-mode can be used with `socket_active` option
* `epgsqli` can do fine-grained flow control because it produces `{epgsql, C, socket_passive}` messages
* other interfaces re-activate the socket under the hood as soon as `epgsql_sock` receives
  `tcp_passive` / `ssl_passive`