RegisterValueFormatter(L"vt", &StdFormatFormatter);
...
...
      if(*s == '\0') {
#ifdef _DEBUG
        if (pos < v.GetCount()) {
          LOG("Not enough formatter: " << pos << " but " << v.GetCount() << " arg(s)");
          NEVER();
        }
#else
        if (pos < v.GetCount()) {
          result << " !MOREARGS! ";
          for (int i= pos; i < v.GetCount(); ++i)
            result << v[i] << ' ';
        }
#endif
        return result;
      }