[tz] [PROPOSED] Merge timezones that are alike since 1970

[Guy Harris]

On May 28, 2021, at 1:44 PM, Stephen Colebourne via tz <tz at iana.org> wrote:

> I maintain, as I always have, that the bare minimum tzdb should
> provide is a full time-zone with history

History going back how far?

And to what extent should we offer a guarantee of historical accuracy?

> for each region identified by an ISO-3166-1 code.

What about regions that aren't?  (Not all are.)