Which time zones make the list in ActiveSupport::TimeZone?

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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