[tz] tz Digest, Vol 34, Issue 19

[Paul Eggert]

On 09/24/2015 06:50 AM, Alexander Borg wrote:
> I don't understand why you combine zones like
>
> +Link Africa/Abidjan Africa/Freetown	# Sierra Leone
>
> thus throwing away valuable pre-1970 DST and Zone data.

It's because those data entries were probably invented by Shanks, our 
unreliable source -- so they were more harmful than valuable. Although 
there is a temptation to invent data to fill in blank spots, we want to 
avoid that temptation when this is practical, which was the case here.