On Fri, 18 Mar 2022 at 14:48, Stephen Colebourne via tz <tz@iana.org> wrote:
My understanding is that tzdb will need to use za, zb, zc after z

There would still be a version-naming conflict at the 33rd release of a year (NNNNzg), it would just be with the 26th release of the downstream project and not the first.

--
Tim Parenti