[tz] Issues with pre-1970 information in TZDB

[Paul Eggert]

On 9/23/21 9:35 AM, Tom Lane via tz wrote:
> After thinking about this for awhile, I think that a lot of our
> problems can be summarized as "backzone is misdesigned".

I'm fully in agreement that better designs are are possible, and would 
be happy to hear about what those better designs would be. This'll take 
more work than we could shoehorn into 2021b of course.