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>  It seems the assumption the two side are compatible is better than assuming the remote side is always IPv6-only.

That's for sure the case, IPv6-only is still rare, but dual-stack vs. IPv4-only is pretty common. And I hope that IPv4 only will die out earlier than IPv6 only arises, at least for us this will be true :wink:. 

Many thanks for the fix and explanation! 
This would indeed surely be a good backport candidate. While IPv4-only servers are becoming more rare nowadays, our example shows they still exist. In case people are curious (that's now of course off-topic!): Our main blocker preventing IPv6 introduction is a controllable DHCPv6 workflow. Many clients don't play well with DHCPv6 (e.g. client-id changing especially when installing a machine via PXE) and we don't want to go down the routes of full autoconfiguration or full static configuration (both would be easy in straightforward, but come at a price). 

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