fr-FR number grouping uses , where Node uses U+202F (narrow no-break space).
console.log((9876543210n).toLocaleString('fr-FR'));
// perry: 9,876,543,210
// node: 9 876 543 210 (U+202F separators)en-US (,) and de-DE (.) are both correct, so the group-separator table is missing the French entry and falling back to the default rather than the locale's own separator.
Related: the Intl.DateTimeFormat/icu4x work already normalizes U+202F in the date path; the number path appears not to carry the same locale data.
Reproduced on a pristine build of bd7cbb7da in a separate worktree, so this predates the current main. Surfaced while writing the gap test for #7427, which omits fr-FR for this reason.
fr-FRnumber grouping uses,where Node uses U+202F (narrow no-break space).en-US(,) andde-DE(.) are both correct, so the group-separator table is missing the French entry and falling back to the default rather than the locale's own separator.Related: the
Intl.DateTimeFormat/icu4x work already normalizes U+202F in the date path; the number path appears not to carry the same locale data.Reproduced on a pristine build of
bd7cbb7dain a separate worktree, so this predates the currentmain. Surfaced while writing the gap test for #7427, which omitsfr-FRfor this reason.