Keep-address-family - bad config reported in turn log

On standard quick-install, the coturn log reports an error in turnserver.conf
Bad configuration format: keep-address-family

What is significance of this, if anything, or can it be ignored? Or is it best to delete that line from turnserver.conf to avoid the error (also easy enough).

This fixes a problem in coturn which was leaking ipv6 sockets open and die at some point.

Very helpful. So, we ignore the error and definitely do NOT remove it from turnserver.conf.