How to control prefix when using kickstart to install with IPv6 auto ?

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Issue

How to control prefix when using kickstart to install with IPv6 auto?
When using kickstart's --ipv6=auto rule, how do I dictate network prefix, so that a /64 subnet is not used?

network --device=eth6 --ipv6=auto --noipv4

Environment

Red Hat Enterprise Linux 6
Kickstart
IPv6 network

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