https://github.com/nats-io/nats-server/blob/eb8620529d422c75c8e445cbadb4697fda90a71a/server/jetstream_api.go#L490 The request payload type `JSApiStreamPurgeRequest` is not part of the documentation at https://docs.nats.io/reference/reference-protocols/nats_api_reference#streams which only mentions the empty payload