IPv4/IPv6 bridging

[SoniEx2]

So let's say I have an IPv4-only machine, and an IPv6-only machine, and I wanna peer-to-peer some files between them, using dat.

In a perfect world, both machines would have IPv6, but this isn't a perfect world. So instead I need the Dat network to come built-in with v4/v6 bridging.

I'd prefer if dual-stack peers acted as tunnels/relays by default. This way you don't need to run explicit tunnels/relays.