Intl.supportedValuesOf('timeZone')
for UTC, Etc/GMT*, and other non-contintent/non-ocean time zone identifiers
#778
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As part of work on proposal-canonical-tz, I noticed that JS engines have very different results from
Intl.supportedValuesOf('timeZone')
for time zones that are not associated with a continent or ocean.V8 does not return any of these zones. Safari returns only one: UTC. Firefox returns 40 zones, including "UTC", Etc/ zones like "Etc/GMT+11", and a few others like "EST" and "CET".
Should the 402 spec be more prescriptive about what kinds of canonical time zone identifiers should vs. should not be returned by this API?
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