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What is a "Context" (`ctx`) typically used for within an Actix actor's message handler?

In this round
  1. What is a "Context" (`ctx`) typically used for within an Actix actor's message handler?
  2. Why might a supervisor/restart strategy (common in actor-model frameworks generally) be a valuable resilience pattern that Actix's actor lifecycle can support?
  3. What does it mean for an actor to be "stopped" in Actix's lifecycle?
  4. Why might using actors be a natural fit for modeling certain kinds of application state, like a chat room's connected participants?
  5. Why might a Rust developer choose an actor-based architecture (via Actix) over directly managing async tasks and shared state with locks?
  6. Why does Actix's actor model help avoid certain classes of concurrency bugs (like data races) common in shared-mutable-state designs?
  7. What is the difference between `.send()` and `.do_send()` when communicating with an Actix actor?
  8. What does a `Handler<M>` trait implementation define for an Actix actor?
  9. What is an Actix "Addr" used for?
  10. What is Actix, in the broader sense (as the name of the umbrella project)?
  11. What does it mean that an actor "owns" its internal state in Actix's model?
  12. Why is understanding Rust's ownership and borrowing model helpful background knowledge before working extensively with Actix?
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