André Bargull

#4352 will fix this test.

I don't think it's necessary to change this. IIRC we only wanted this to be sorted to ensure the output is more deterministic. (Deterministic insofar as that consecutive calls to...

Does this require any changes in ? Right now neither `era` nor `timeZoneName` are required to be present in the minimum available formats. That means for example when requesting `{era:...

> (Although, maybe this is slightly different because dayPeriod _is_ present with other fields.) Yes, this is the important difference. Standalone `dayPeriod` is not required to be an available format,...

See Annex B for why `/[\d-\D]/` doesn't throw a SyntaxError in browsers.

Yes, this is caused by ICU. The spec actually allows this behaviour, though. [FormatDateTimePattern](https://tc39.es/ecma402/#sec-formatdatetimepattern) selects the formatting options from `rangeFormatOptions`, which can have different options than what's stored in `dateTimeFormat`.