[tz] zic bug: Wall-clock ordering of transition times

[Paul Eggert]

On 12/6/20 10:06 AM, Michael H Deckers via tz wrote:
>      I find it a bit embarrassing that the precise semantics of zic input
>      is only known to C compilers

We should document zic's behavior better, yes. As I vaguely recall, it's done 
this way on purpose and so is a feature and not a bug. Perhaps Arthur's 
less-fallible memory can cite chapter and verse about when and why the behavior 
was put into zic.

I gave the documentation a shot by installing the attached patch into the 
development version. Further improvements would be welcome.
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