[tz] Issues with pre-1970 information in TZDB

[Paul Eggert]

On 9/22/21 3:08 PM, Stephen Colebourne via tz wrote:
> there is now no way to tell
> whether a Link is a true alias (a spelling change) or a meaningful ID
> like Europe/Oslo.

Sure, but this has always been true of Links; there's nothing new here. 
For example, the very first edition of 'backward', back in 1993, had 
this Link:

Link	Australia/Sydney	Australia/ACT

even though Sydney is not in the Australian Capital Territory. That's 
not a simple spelling change; it's a meaningful ID, if one's definition 
of "meaningful" includes political meanings. Europe/Oslo is similar to 
Australia/ACT in this respect.