[tz] Moving more zones to 'backzone'

Paul Eggert eggert at cs.ucla.edu
Thu Jul 7 13:44:51 UTC 2022

Release 2021b moved to 'backzone' nine zones whose timestamps since 1970 
were duplicates of other zones, as part of a process that started in 
2013 in the interests of removing prior inequities, one step at a time. 
If we were to continue this process in the same way, we could install 
the attached proposed patch which would move more zones, chosen via the 
same procedure used for 2021b.

It strikes me, though, now that Stephen Colebourne has established a 
mechanism that can let downstream users keep the duplicate-since-1970 
zones, that it may be a more effective use of our time to move the rest 
of the duplicate-si ce-1970 zones now, while no urgent changes are 
pending. This would move another twelve zones if I've counted correctly, 
and would let us more efficiently turn our attention to other issues.

Comments welcome.
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