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Add Temporal duration and DateTimeFormat regression coverage - #5097

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arshaw wants to merge 2 commits into
tc39:mainfrom
fullcalendar:temporal-coverage-gaps
Open

Add Temporal duration and DateTimeFormat regression coverage#5097
arshaw wants to merge 2 commits into
tc39:mainfrom
fullcalendar:temporal-coverage-gaps

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@arshaw

@arshaw arshaw commented Jul 27, 2026

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Adds Test262 coverage for two previously uncovered behaviors:

  • Temporal.Duration.from() rejects duration strings with a date component followed by a dangling time designator, such as P1DT.
  • Intl.DateTimeFormat honors inherited and non-enumerable options when formatting a Temporal.PlainDate.

The DateTimeFormat test compares against a reference formatter instead of hard-coding locale-specific output.

CC @ptomato

@arshaw
arshaw requested a review from a team as a code owner July 27, 2026 22:39
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