hostname.if on 4.7 ignoring "-inet6"

[rhsv6]

Hello list,

I'm looking to explicitly disable IPv6 on interfaces where it is 
not used.  This includes link local addresses.

However, this :

# cat /etc/hostname.em0                                             
                                         
description "Some Port"
media 1000baseT
inet 172.16.176.166 255.255.255.252 NONE
-inet6
up


Does not have the desired effect :

em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        lladdr 00:aa:bb:cc:dd:ee
        description: Some Port
        priority: 0
        media: Ethernet 1000baseT (1000baseT full-
duplex,rxpause,txpause)
        status: active
        inet 172.16.176.166 netmask 0xfffffffc broadcast 
172.16.176.167
        inet6 fe80::bbbb:ffff:eeee:6273%em0 prefixlen 64 scopeid 0x1