code: public void setFrenchCollationDefault() {
          checkNotFrozen();
          CollationSettings defaultSettings = getDefaultSettings();
          if(settings.readOnly() == defaultSettings) { return; }
          CollationSettings ownedSettings = getOwnedSettings();
          ownedSettings.setFlagDefault(CollationSettings.BACKWARD_SECONDARY, defaultSettings.options);
          setFastLatinOptions(ownedSettings);
      }
docs: Sets the French collation mode to the initial mode set during construction of the RuleBasedCollator. See
  setFrenchCollation(boolean) for more details.
  
  @see #isFrenchCollation
  @see #setFrenchCollation(boolean)