[tz] Breach of tzdb charter: Merging timezones is not within the charter

[Tom Lane]

Paul Eggert <eggert at cs.ucla.edu> writes:
> On 6/2/21 7:16 PM, Tom Lane via tz wrote:
>> I just experimented and confirmed that including backzone isn't nearly
>> sufficient to bring the output data back to what it was previously.

> It is sufficient, in the sense that if you included backzone before and 
> still include it now, there are no changes to any timestamps (either 
> pre- or post-1970). I've tested this.

Sorry for not clarifying.  Up to now, we've followed tzdb's default
output (currently, we just use tzdata.zi as shipped in the tarball).
It's that definition that I'd like to stick to, and adding backzone
to the build options doesn't match it as of HEAD.

			regards, tom lane