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@clacke@libranet.de the correct behavior is to send the delete to basically everyone, since you never know where it might have been federated to (via fetches or relaying)
other msky variants only send it to your followers

as for other software, all msky variants cascade deletes
so let's say you have a thread of notes A -> B -> C -> D
on a deletion of B, all msky variants will trigger a deletion of C and D as well