[tz] 1981/2 Singapore+Malaysia switch from GMT+0730 to GMT+0800

[Paul Eggert]

On 2022-12-01 01:22, Stephen Colebourne via tz wrote:
> if you are making a change that affects one of
> the non-backzone files, but the change also impacts one of the
> backzone locations, you should also be responsible for updating
> backzone.

Surely the responsibility for maintaining data outside TZDB's normal 
scope should be on those who want the out-of-scope data to be maintained.

'backzone' has long contained lower-quality data, including data 
inconsistent with the main data. Although I don't have the time or 
inclination to fix that, if you or someone else does then please feel 
free to submit patches. Any 'backzone' patches need not be applied 
simultaneously with patches to the main data; it's OK to take all the 
time you need to think through how 'backzone' should be improved.