presto-spi/src/main/java/io/prestosql/spi/type/Decimals.java/Decimals/encodeUnscaledValue
class Decimals:    @SuppressWarnings("NumericCastThatLosesPrecision")
    public static Slice encodeUnscaledValue(BigInteger unscaledValue)
    {
        return unscaledDecimal(unscaledValue);
    }