Clojurians Log v2

I created a flow with m/observe where I get a ! Function that I can call to send events/data. So when there is no consumer I cannot /will not send events. When there is one consumer then calling the ! function will push the event to the consumer. I guess the function will block until the one consumer has read the data. Then I added two consumers and found out that only the last added consumer will get all the events. This behavior seems to be consistent. Now when I wrap my m/observe flow with m/stream then all consumers get all events. So I wonder how long ! Function will block .. I guess until all consumers have read an event. But I am not sure .. might be there is no blocking at all. Any ideas? Thanks!