https://github.com/tc39/proposal-temporal/pull/1952 added support for time
designator prefixes in PlainTime strings. This adds three tests to all
entry points that convert an ISO string to a PlainTime:
- no-implicit-midnight: ISO strings with only a date and no time are no
longer accepted. Previously they were implicitly interpreted as 00:00.
- with-time-designator: Tests that various forms of string with time
designator are correctly parsed.
- time-designator-required-for-disambiguation: Tests various cases where
a string without a time designator is ambiguous and therefore the time
designator is required, as well as various cases that implementations
might assume are ambiguous but in fact are not.
This was a normative change that achieved consensus at the December 2021
TC39 meeting.
Philip Chimento