Rails core - May 2013 - time_zone_options_for_select values use full zone name?

I''m curious about something I noticed with
time_zone_options_for_select.
The existing implementation sets up a lambda to convert the zones into 
something usable by options_for_select. That lambda looks like:

convert_zones = lambda { |list| list.map { |z| [ z.to_s, z.name ] } }

z.to_s returns the Rails TimeZone name. Are these standard names for other 
systems? They do not seem to be. Is there a logical reason we don''t do 
something like this instead?

convert_zones = lambda { |list| list.map { |z| [ z.tzinfo.identifier, z.name ] }
}

This uses the TZ identifier as the value in the select list instead of the 
Rails TimeZone name. As far as I can see from ActiveSupport::TimeZone, the 
TZ identifier would work as well as the Rails TZ name.

My problem is this. I''m storing the TZ returned from a TZ select into a
field in a Postgres database. I would "like" to be able to use that TZ
in
Postgres queries but the Rails TimeZone seem to be non-standard and 
unsupported by Postgres directly. Postgres either expects a full zone name 
(tzinfo.identifier) or a zone abbreviation:
http://www.postgresql.org/docs/9.2/static/datatype-datetime.html#DATATYPE-TIMEZONES

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