wsrep_cluster_address does not accept IPv6 addresses

According to https://mariadb.com/kb/en/mariadb/does-mariadb-support-ipv6/, ``The Galera wsrep_node_address setting has accepted ipv6 since MariaDB 10.1.8''.
However, setting
wsrep_cluster_address="gcomm://fd00::1,fd00::2,fd00::3"
will result in

[Warning] WSREP: Failed to resolve tcp://fd00::1
[Warning] WSREP: Failed to resolve tcp://fd00::2
[Warning] WSREP: Failed to resolve tcp://fd00::3

Note that this is a parsing problem--substituting the aformentioned addresses with names will work:
wsrep_cluster_address="gcomm://galera01.vserver01,galera01.vserver02,galera01.vserver03"

(The latter, however, especially in the case of local addresses, requires you to use, e.g., unbound to map those names to addresses in the first place.)