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.