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ASA failover interface on separate vlan. Why?

I'm working on a setup where the failover and stateful interfaces are on one physical connection over a switch.  The stateful interface is on a separate vlan while the failover interface is on a vlan shared with some other devices.

I want to create a new vlan for the failover interface but wanted to know why exactly the docs say to have it on a separate vlan.  I can make a guess that it's just more secure but wanted other input.

http://www.cisco.com/en/US/docs/security/asa/asa82/configuration/guide/ha_overview.html#wp1077563

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