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>> I'm expecting, by the way, that the deprecation will leave fec0::/10
>> to be treated as global-scope unicast addresses, rather than making
>> fec0::/10 addresses cease to function altogether.
>
> That's an interesting expectation. As co-author of the planned
> deprecation draft, I'd been assuming a more classical deprecation
> action, in which we would simply state the previous semantics of
> FEC0::/10, state that the prefix SHOULD NOT be used, but leave it
> permanently assigned by IANA.
>
> This would break nothing that runs today.
>
> What do people think?
>

As with reusing /8s in IPv4, keep as IANA reserved for a while, then 
use.

- - kurtis -

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