docs: def from_dict(cls, message):
          """Return an message from a dict output by Async.to_dict."""
  
          message_options = message.copy()
  
          # JSON don't like datetimes.
          eta = message_options.get('task_args', {}).get('eta')
          if eta:
              from datetime import datetime
  
              message_options['task_args']['eta'] = datetime.fromtimestamp(eta)
  
          return Message(**message_options)