The documentation for ActiveSupport::TimeZone says one of the goals for the 
class is to "Limit the set of zones provided by TZInfo to a meaningful 
subset of 146 zones."

Is there a canonical reference for these 146? It seems to me you'd want all 
the Time Zones defined by the TZInfo gem which in turn uses the IANA Time 
Zone database. I know you can include the tzinfo gem to get them all 
somehow but I'm just wondering how the list of 146 was derived (especially 
when other references say there are only 24 time zones around the world, 
which if you're going for simplicity might have been another way to go).

I'm especially interested if N. Korea's recent change to be a half hour off 
of Japan's time zone (creating their own Time Zone) should be added to 
ActiveSupport::TimeZone. It has been added already to the IANA Time Zone 
database.

Andy

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