Issue in the example of logical replication

[dm-code-prog-armenotech]

Hello,
I have looked at the examples provided, and a line is unclear to me.
https://github.com/jackc/pglogrepl/blob/master/example/pglogrepl_demo/main.go#L129

Whenever we receive a keep-alive message, we move the client's WAL position to the current end of WAL on the server.
This does not seem right.
Could you please comment on that? Maybe I am missing something.

Thanks in advance.

[JordanP]

@dm-code-prog-armenotech looks like #59 has some explanations