# Changes in 0.3.0-alpha.1

* Switched to asynchronous operation

  This vastly simplifies handler creation because
  what used to be the RequestData is now not carried explicitly any more.
  Instead, the Rust compiler creates it implicitly in the form of the locals that are around
  across the await for the ServerRequest::response result.

  This introduces one regression in that a server can not handle multiple requests
  before serving the first response
  (because the future holds the &mut handler):
  Accessing the handler exclusively between request and respons handling was possible,
  but not used by any known implementation of a CoAP stack.

# Changes in 0.2.0

* Documentation updtes.

# Changes in 0.2.0-alpha.1

* Update coap-message to 0.3.0-alpha.1
  (the "fallible write operations" release).

* Make request extraction and response creation fallible.

  Upgrading applications may compatibly use the Infallible type as the error
  and carry errors such as the presence of unknown critical options in the success variant.
  As all fallible steps of creating a response provide a suitable union error type,
  this helps with ergonomics.

* Undeprecate the implementation of coap-handler for Option.

  This is something that can not be added downstream,
  it's handy
  and does not cause much of maintenance load.

* Remove all deprecated items.
  They are found in `coap-handler-implementations` instead.