What is this extract saying?: (b) “Democratic theory conventionally defines a constitution as a 'higher law that cannot be changed through normal lawmaking procedures in a popularly elected assembly. Exceptional legal entrenchment issued to insulate constitutional rules from the majoritarian controls that purportedly govern ordinary legislation. In this way, a constitutional text strives to make fast the fom of government (a presidential or parliamentary, a unitary or federal republic), the limits of government (inviolable rights and immunities), and the goals for which government is empowered to act (to ensure domestic tranquility, provide for the common defence, and promote general welfare)"