<prompt> Translate the following text to EnglishKatika maamuzi ya hivi karibuni, Mahakama Kuu imeelezea sera za upendeleo na imeeleza wazi kwamba zinaweza kupunguzwa au kuondolewa na sheria.  <response>: In recent decisions, the Supreme Court has both circumscribed preferential policies and made clear that they can be limited or abolished by legislation. 