Extend API to be able to Ban/Unban up to 100 ID's similar to blocking
For managing Bans without having to create an IRC connection and to remove the issue of running into the global message limit when banning large numbers of users or cleaning out a large banlist
55
votes

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Pengaloni_Pangles commented
I quote this. Having to connect to a client to ban or unban slows you down a lot when you have a huge list.