Restricting outgoing connections to IPv4 - configuration

hi,

It appears I (partially) implemented TODO #93: request only IPv4 addresses 
so outgoing connections don't use IPv6. I simply set hints.ai_family to 
AF_INET and currently use the configuration directive:
   force-ipv4 0|1

What should the configuration look like? The same trick likely works for 
forcing IPv6.


     Christiaan

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