2 May be "advertise" (the default), "allow", or "ignore". If "advertise",
3 the server will respond to the client sending "unborn" (as described in
4 linkgit:gitprotocol-v2[5]) and will advertise support for this feature during the
5 protocol v2 capability advertisement. "allow" is the same as
6 "advertise" except that the server will not advertise support for this
7 feature; this is useful for load-balanced servers that cannot be
8 updated atomically (for example), since the administrator could
9 configure "allow", then after a delay, configure "advertise".