The channel this mode refers to, where applicable.
The data associated with the Mode, if applicable. This is often a number, such as what l takes (join limit).
Users that are explicitly exempt from the Mode.
The character that implies this Mode (i, z, l ...).
Whether or not this Mode should be considered to be its own antithesis.
A channel mode.
Some modes overwrite themselves; a channel may be +i or -i, never i twice. Others stack; a channel may have an arbitrary number of b bans. We try our best to support both.