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

[Michael H Deckers]

    On 2021-05-28 20:44, Stephen Colebourne via tz wrote:
> I maintain, as I always have, that the bare minimum tzdb should
> provide is a full time-zone with history (not a Link) for each region
> identified by an ISO-3166-1 code.
     I think you can have exactly that if you use
     the backzone data. This is even more stable
     than the non-backzone data), because a
     timezone changes only when the data for
     this very timezone are changed (as opposed
     to a timezone that was or is linked to it).

     Michael Deckers.