Not viewed from the socket programmer's point of view.
Look at how an AF_INET6 socket behaves when given
an address like ::FFFF:192.0.2.3
afaik the behavior is then exactly what you describe.
Whether the stacks are independent code modules or
alternate paths through the same code is irrelevant
to the externally observed behavior.
see draft-ietf-v6ops-security-overview-06.txt section 2.2.
itojun
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