📜 WAYPOINT LESSON
Checkpoint — Architecture Reasoning
⭐ beginner⏳ 8 min read📍 Lesson 201 of 204
The bus contract frozen, with the mid-flight unsubscribe case made explicit.
What you must be able to do
Guarantee dispatch order and mid-flight unsubscribe semantics — the two details that decide whether an event bus is debuggable in production.