(self, prec)
Also known as round-towards-0, truncate.
Also known as round-towards-0, truncate.
Also known as round - towards - 0 truncate .
def _round_down(self, prec):
        """Also known as round-towards-0, truncate."""
        if _all_zeros(self._int, prec):
            return 0
        else:
            return -1
def _round_down ( self , prec ) : if _all_zeros ( self . _int , prec ) : return 0 else : return - 1