Return a boolean indicating if ``value`` is a member of set ``name``
        send raw (source) values here. Right functioning with other values
        not guaranteed (and even worse).

def sismember(self, name, value):
        """
        Return a boolean indicating if ``value`` is a member of set ``name``
        send raw (source) values here. Right functioning with other values
        not guaranteed (and even worse).
        """
        return self.storage.sismember(name, self.dump(value))