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* Bindings now require that `fields` is defined on the class body so all fields
are not sent by default. To restore old behaviour, set it to ['__all__']
* Bindings can now be declared after app.ready() has been called and still work.
* Binding payloads now include the model name as `appname.modelname`.
* A worker_ready signal now gets triggered when `runworker` starts consuming
messages. It does not fire from within `runserver`.