Keberlakuan hukum perdata dalam pembagian waris secara adat bagi warga negara Indonesia Keturunan Tionghoa (studi kasus Putusan Mahkamah Agung Nomor 147K/PDT/2017) = Civil law enforcement in customary distributing of inheritance for Indonesian citizens of Chinese descent (case study of supreme court verdict number 147 K/PDT/2017