[tz] Proposal to deprecate "." and "-" in zone names

[Clive D.W. Feather]

Tobias Conradi said:
> If in SVG "/" is not allowed for ids, then the / is hindering map
> creation, because one would need conversion or mapping.

Compared with the effort of creating the SVG in the first place, the
mapping of / to something else is trivial. Please stop wasting our time.

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