+ fixed an old bug that affected our numeric delivery:
Imagine we have a scenario like this:
[origin A on server 0] --> [OUR IRCD] --> [TS6 server] --> [TS5 server and target Z]
We'd try to address Z by its null ID only because the next server on the way
is TS6. That led to delivery failure in cases like
ts6(origin)->ts6->ts6->ts5(target).
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