We should note that, from a protocol point of view, there is no need to use the M bit to control stateless address configuration. This function is already achieved by the "Autonomous flag" in the prefix information option. If the flag is not set, the hosts will not configure information from the prefix.
Christian, you are overlooking the possible situation where address configuration through DHCP is desired, but there are also hosts that don't support DHCP. In this case stateless address configuration can't be turned off.
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