Currently, this test is not conformant to the proposal text.
Temporal.TimeZone.from() calls ToTemporalTimeZone. Since the argument is
a string, we next go to ParseTemporalTimeZone, where on a string such as
`1994-11-05T08:15:30-05:00[UTC]` we would return _result_.[[Name]] (which
would be equal to `UTC`) and discard the UTC offset string.
Unfortunately, in #3304 I made a last-minute mistake when I added the
uncallable value to the assertion message, and neglected to test it;
Symbols can't be converted to strings like that, so these tests would
fail. This fixes the assertion messages.
Tests for the normative changes made to Temporal in
https://github.com/tc39/proposal-temporal/pull/1829
In a previous version of the specification, there was a fallback to the
intrinsic getOffsetNanosecondsFor when it was undefined.
Frank Yung-Fong Tang
Philip Chimento
Frank Tang
André Bargull