[tz] Inconsistencies between backward and backzone

[Paul Eggert]

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.