[tz] Inconsistencies between backward and backzone

Paul Eggert eggert at cs.ucla.edu
Thu May 4 21:56:57 UTC 2023

On 5/4/23 07:09, Benjamin Drung via tz wrote:
> building with
> PACKRATLIST=zone.tab in addition to PACKRATDATA=backzone

Yes, that should be better than building with just PACKRATDATA. However, 
why not omit both macros? That's simpler and has fewer issues with 
compatibility and data quality.

> Then all those inconsistencies will be resolved, but
> Asia/Hanoi will be gone.

It's not gone compared to tzdb proper, which has never had an Asia/Hanoi 
entry. PACKRATDATA=backzone PACKRATLIST=zone.tab is designed to 
resurrect out-of-scope and lower-quality pre-1970 data that was formerly 
in tzdb proper, not to drag in all out-of-scope lower-quality pre-1970 
data that exist in backzone.

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