The spec is changed because this can be non-contiguous. Currently, CLDR does not have the right data for Burnei (Friday + Sunday for weekend), but it will be supported in the future release.
https://github.com/tc39/proposal-intl-locale-info/pull/44
Created attachment 437799 [details] Patch
Comment on attachment 437799 [details] Patch r=me (pending EWS)
Committed r282257 (241535@main): <https://commits.webkit.org/241535@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 437799 [details].
<rdar://problem/82975015>