=== GET /sse/silent?timeoutMs=1200 : whole response ===
| HTTP/1.1 200 
| Content-Type: text/event-stream
| Transfer-Encoding: chunked
| Date: Thu, 03 Sep 2026 18:59:34 GMT
| Connection: close
| 
| 1f
| event:hello
| data:then silence
| 
| 
| 0
| 
=== stream ended after ~1697 ms ===
=== registry.timedOut(): 0 -> 1 ===

=== client closed the socket, then: ===
broadcasts before the write failed : 2
registry.sendsOk                   : 1
registry.sendsFailed               : 0 -> 1
registry.open                      : 0
=== writes that appeared to succeed after the client was gone: 1 ===