-> #dict of all |{key: value}| entries in :prop:key_prefix of
                :prop:_client

def all(self):
        """ -> #dict of all |{key: value}| entries in :prop:key_prefix of
                :prop:_client
        """
        return {
            self._decode(k): self._loads(v)
            for k, v in self._client.hgetall(self.key_prefix).items()
        }