*** John Goerzen [2022-02-24 16:00]:
>I suspect it wouldn't require any breaking changes (would
>be compatible with older versions unless the new ACK options are turned

Absolutely no incompatible changes. Only if ACK packets are received by
an old NNCP version, it will fail and claim about unknown packet type.

-- 
Sergey Matveev (http://www.stargrave.org/)
OpenPGP: CF60 E89A 5923 1E76 E263  6422 AE1A 8109 E498 57EF