The last five lines below are simply WRONG and not according to the spec.
```
const durationFormat = new Intl.DurationFormat();
verifyNotEnumerable(durationFormat, Symbol.toStringTag);
verifyNotWritable(durationFormat, Symbol.toStringTag);
verifyConfigurable(durationFormat, Symbol.toStringTag);
```
Move part of the test of toLocaleString which depends on
15 Amendments to the ECMAScript® 2021 Internationalization API Specification
to intl402. Keep behavior specified in earlier chapters in built-ins
* Add tests for "Intl NumberFormat v3" proposal
This patch is intended to cover only one aspect of the proposal for
ECMA402: the "interpret strings as decimals" feature.
* fixup! Add tests for "Intl NumberFormat v3" proposal
IANA TimeZone name other than "UTC" is only required if the implementation " includes the ECMA-402 Internationalization API"
https://tc39.es/proposal-temporal/#sec-isvalidtimezonename
Therefore, we need to split the test and keep this one without checking "America/Vancouver"
Add a case to test withtout the ":"
This patch is intended to cover only one aspect of the proposal for
ECMA402: the "grouping enum" feature. It also includes coverage for the
formatting option as already defined by the latest version of ECMA402.
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/1875
For convenience, adds some functions to TemporalHelpers to assert that two
Temporal objects are equal, for Duration, Instant, PlainDateTime,
PlainTime, and ZonedDateTime.
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.
