docs: private static void _initialFillSet (@Nonnull final ICommonsOrderedSet <String> aSet,
                                         @Nullable final String sItemList,
                                         final boolean bUnify)
    {
      ValueEnforcer.notNull (aSet, "Set");
      if (!aSet.isEmpty ())
        throw new IllegalArgumentException ("The provided set must be empty, but it is not: " + aSet);
  
      if (StringHelper.hasText (sItemList))
      {
        // Perform some default replacements to avoid updating all references at
        // once before splitting
        final String sRealItemList = StringHelper.replaceAll (sItemList,
                                                              EXTENSION_MACRO_WEB_DEFAULT,
                                                              "js,css,png,jpg,jpeg,gif,eot,svg,ttf,woff,woff2,map");
  
        for (final String sItem : StringHelper.getExploded (',', sRealItemList))
        {
          String sRealItem = sItem.trim ();
          if (bUnify)
            sRealItem = getUnifiedItem (sRealItem);
  
          // Add only non-empty items
          if (StringHelper.hasText (sRealItem))
            aSet.add (sRealItem);
        }
      }
    }