Discrepancy between zone.tab ordering and northamerica details

[Clive D.W. Feather]

Eric Fischer said:
> We just ran into a bug at work where users in US Central Time were
> identified as being in America/Indiana/Knox instead of in
> America/Chicago because code was running through the list of time
> zones in zone.tab looking for the first one that matched the current
> GMT offset and DST state, and America/Indiana/Knox is currently
> observing CDT and ordered before America/Chicago.
> 
> I hope this is actually a use that the file ordering is intended to
> support,

I don't see how it can be. In general, there are going to be multiple zones
that match a given GMT offset and DST state, so what makes anyone think
that the first one that matches is theirs? If it were always true, we
wouldn't need the other ones.

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