code: function _extractLocaleDays(abbr, locale) {
        if(abbr) {
          return cldr ? cldr.extractDayNames(locale).format.abbreviated : ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'];
        }
        else {
          return cldr ? cldr.extractDayNames(locale).format.wide : ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'];
        }
      }
docs: Extracts the wide or abbreviated day names for a specified locale.
  If cldr is not installed values default to that for locale en_US.
  
  @param {Boolean} abbr
  @param {String} locale
  @api private