[tz] Adding a "test" region?

[Clive D.W. Feather]

Paul G said:
> All this hubbub about the negative SAVE values in the tzdb source code makes it pretty obvious that downstream consumers are making some assumptions about undocumented features of the tzdb code. I'm wondering if it might be worth it to add a new region that contains fictional time zones that have properties that are perfectly valid but are edge cases that might be improperly handled downstream.

That sounds a really good idea.

> - Zone with negative DST
> - Zone with large DST offset and/or large standard offset
> - Zone with 3, 4 or 5 offsets per year

Zone which changes every month, or even every week.

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Clive D.W. Feather          | If you lie to the compiler,
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