[Ltru] Region subtag changes

Doug Ewell scripsit:

> I'd be interested if somebody could come up with a plausible scenario
> that would result in circular P-V assignments.

What about a country reverting to an earlier name?  We have two historical
examples I can think of offhand, Central African Republic -> Central
African Empire -> Central African Republic (which probably didn't affect
the code) and Dem. Rep. of Congo -> Zaire -> Dem. Rep. of Congo (which
did, fortunately before Date A).

We might have another someday in Burma -> Myanmar -> Burma, since the
dissidents (I believe this is correct) object to the process by which
the (Latin-script) name of the country was changed.  We already have BU
deprecated in favor of MM; if the name is changed back and the old code
is revived, we might end up with MM deprecated in favor of BU.

-- 
                Si hoc legere scis, nimium eruditionis habes.

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