OPT_LOOPBACK
optval(arg->bundle, OPT_LOOPBACK));
if (Enabled(bundle, OPT_LOOPBACK)) {
bundle.cfg.optmask = (1ull << OPT_IDCHECK) | (1ull << OPT_LOOPBACK) |
"disable|enable", (const void *)OPT_LOOPBACK},