serialize JSON-RPC-Request

        :Parameters:
            - method: the method-name (str/unicode)
            - params: the parameters (list/tuple)
            - id:     if id=None, this results in a Notification
        :Returns:   | {"method": "...", "params": ..., "id": ...}
                    | "method", "params" and "id" are always in this order.
        :Raises:    TypeError if method/params is of wrong type or
                    not JSON-serializable

def assemble_request(method, params=tuple(), id=0):
        """serialize JSON-RPC-Request

        :Parameters:
            - method: the method-name (str/unicode)
            - params: the parameters (list/tuple)
            - id:     if id=None, this results in a Notification
        :Returns:   | {"method": "...", "params": ..., "id": ...}
                    | "method", "params" and "id" are always in this order.
        :Raises:    TypeError if method/params is of wrong type or
                    not JSON-serializable
        """
        if not isinstance(method, (str, unicode)):
            raise TypeError('"method" must be a string (or unicode string).')
        if not isinstance(params, (tuple, list)):
            raise TypeError("params must be a tuple/list.")

        return {
            "method": method,
            "params": params,
            "id": id
        }