And we need groups of locales for teams that are split across multiple locations; e.g.:

  new_date = add_workdays(
    workdays=1.5,
    start=datetime.now(),
    regions=["es", "mx", "nl", "us"],
  )

Hopefully "es" will have Siesta support too.

Might be better to calculate them separately for each locale and then tie-break with your own approach (min/max/avg/median/etc.)