How to find out whether or not an event wants the client object [SOLVED]

[Conan]

Note the EventOutputAppendClient0 = 1; field. Some events want this, and others dont. I can see which ones do and dont with dumpOutputEvents(), but i cant find out whether or not an event wants it through code.

How do I tell which do and which dont?

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[Zeblote]

$OutputEvent_AppendClient[classname, id]