docs: private String[] expandArgs(String[] originalArgv) {
          List<String> vResult1 = Lists.newArrayList();
  
          //
          // Expand @
          //
          for (String arg : originalArgv) {
  
              if (arg.startsWith("@") && options.expandAtSign) {
                  String fileName = arg.substring(1);
                  vResult1.addAll(readFile(fileName));
              } else {
                  List<String> expanded = expandDynamicArg(arg);
                  vResult1.addAll(expanded);
              }
          }
  
          // Expand separators
          //
          List<String> vResult2 = Lists.newArrayList();
          for (String arg : vResult1) {
              if (isOption(arg)) {
                  String sep = getSeparatorFor(arg);
                  if (!" ".equals(sep)) {
                      String[] sp = arg.split("[" + sep + "]", 2);
                      for (String ssp : sp) {
                          vResult2.add(ssp);
                      }
                  } else {
                      vResult2.add(arg);
                  }
              } else {
                  vResult2.add(arg);
              }
          }
  
          return vResult2.toArray(new String[vResult2.size()]);
      }