[tz] Fractional seconds in zic input

[Paul Eggert]

On 02/05/2018 09:18 AM, John Hawkinson wrote:
> I think it is a very serious workflow problem that these potentially destabilizing changes are committed to the tz source tree prior to any discussion.

I don't see anything potentially destabilizing about these particular 
changes. They make zic more-generous about the data it will accept, and 
they do not change data used by current downstream users.

The potentially-destabilizing thing here is the possibility that new 
data will contain fractional seconds, with no alternative available that 
uses the old format. That would indeed be potentially-destabilizing, but 
it's not what's been installed and it's definitely something that should 
be discussed before it happens.

> they were committed on Wed Jan 31 23:13:35 2018 -0800 and then discussion was initiated at Sun, 4 Feb 2018 08:37:52 -0800.

The changes were not published on GitHub until the weekend (the exact 
timestamp of  isn't maintained on GitHub as far as I know). The 
Wednesday timestamp is that of a patch I prepared on Wednesday but did 
not push to GitHub until this weekend. (At times I pause work on tzdb 
and work on something else and one of those times was Wednesday through 
the weekend.) I initiated discussion on the topic at the moment I 
noticed the changes hitting GitHub.