In the help text for the setting “Auto close messages post count”, it states:
Maximum number of posts allowed in a message before it is automatically closed (0 to disable)
When I set this to zero, it alerts that:
auto_close_messages_post_count: Value must be between 100 and 10000.
This seems contradictory to the help text above!
Not at all urgent, but just stumbled across it when I was looking at a setting change.