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Japanese eras can begin in the middle of a month. This adds tests for the existing behavior, which is that PlainYearMonth.from returns a PlainYearMonth with an era matching the first day of the month, even when that conflicts with the era given by the argument.

See tc39/proposal-temporal#3150 for more details.

Japanese eras can begin in the middle of a month. This adds tests for
the existing behavior, which is that PlainYearMonth.from returns
a PlainYearMonth with an era matching the first day of the month,
even when that conflicts with the era given by the argument.

See tc39/proposal-temporal#3150 for more details.
@catamorphism catamorphism requested a review from a team as a code owner November 4, 2025 22:37
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