In practice, there has been very little edit warring on Fanlore and plenty of discussion. If a consensus cannot be reached, users should appeal first to the gardeners and then, if a solution still can't be found, to the wiki committee. Our policy:

http://fanlore.org/wiki/Fanlore:Managing_Conflict#If_it_is_a_dispute_with_another_user.2C_perhaps_over_a_malicious_edit