Implement Temporal.PlainYearMonth.prototype.toLocaleString #5083

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1. jedel1043

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   C-IntlChanges related to the `Intl` implementationChanges related to the `Intl` implementation

   on Mar 15, 2026
2. jedel1043

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   issue type on Mar 15, 2026
3. jedel1043

   added a parent issue on Mar 15, 2026

   • Implement missing internationalization related methods #1562
4. alienx5499 commented on Mar 15, 2026

   

   alienx5499

   on Mar 15, 2026

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   Hi @jedel1043,

   I’ve opened a draft PR for this: #5098.

   It follows the same approach as in #5080, reusing the shared format_date_time_locale pipeline and avoiding extra Intl.DateTimeFormat allocations.

   The PR currently depends on the refactor in #5080. Once #5080 lands, I’ll rebase #5098 onto main so it only contains the Temporal changes for this issue.

   If the direction looks good, please feel free to assign the issue to me.

   Thanks!