[tz] Why is "AEST" the abbreviation for Australia/Sydney in 1900?

[Paul Eggert]

On 2024-05-03 18:09, brian.inglis--- via tz wrote:
> does zic disallow %s without a rule 
> named, and should whatever is dis-/allowed be added to the docs?

Yes it does disallow %s in that situation. I tried to capture that in 
the recent doc change 
<https://github.com/eggert/tz/commit/1e75b31fa9d110aeb2ed5fa13bed5f5c8ec633e8> 
which says that a rule must exist for %s one way or the other.