Create futures from inputs with the current value for that address
        at the start of that context.

        Args:
            address_values (list of tuple): The tuple is string, bytes of the
                address and value.

def create_initial(self, address_values):
        """Create futures from inputs with the current value for that address
        at the start of that context.

        Args:
            address_values (list of tuple): The tuple is string, bytes of the
                address and value.
        """

        with self._lock:
            for add, val in address_values:
                self._state[add] = _ContextFuture(address=add, result=val)