https://github.com/tc39/proposal-temporal/issues/1910 found a bug in an
indentation level of a line in the Temporal proposal, which affected the
outcome of the PreparePartialTemporalFields abstract operation. This adds
tests for all entry points that use that abstract operation, to make sure
the behaviour is correct: only defined properties are copied in with()
methods.
This was a normative change that achieved consensus at the December 2021
TC39 meeting.
https://github.com/tc39/proposal-temporal/issues/1753 records the
consensus reached at the October 2021 TC39 meeting to disallow "-000000"
as an extended year, both in Date.parse and Temporal. This adds tests for
the Temporal part of that.
