[tz] Non-ASCII outside comments?

[Arthur David Olson]

Prompted by the introduction of non-ASCII into comments, I checked how zic
handles a...
    Zone America/San_José
...line and discovered that, at least on the test system, it seems to do a
right thing.

Should zic permit non-ASCII characters in zone names? In time zone
abbreviations?
If they are permitted, should zic warn about them?

    --ado
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