Penafsiran konstitusi berdasarkan Pancasila dengan pendekatan purposif Aharon Barak: relevansinya dalam pengujian undang-undang terhadap UUD NRI tahun 1945 di Mahkamah Konstitusi Republik Indonesia periode 2015-2018 = Constitutional interpretation based on Pancasila using Aharon Barak purposive approach: relevancy in reviewing the law against 1945 Constitution of the Republic of Indonesia at the Constitutional Court of the Republic of Indonesia during 2015-2018