rightShift

        pub fn rightShift(self: *Self, shift: usize) void {
            var read_index: usize = 0;
            var write_index: usize = 0;
            var n: MantissaT = 0;
            while (math.shr(MantissaT, n, shift) == 0) {
                if (read_index < self.num_digits) {
                    n = (10 * n) + self.digits[read_index];
                    read_index += 1;
                } else if (n == 0) {
                    return;
                } else {
                    while (math.shr(MantissaT, n, shift) == 0) {
                        n *= 10;
                        read_index += 1;
                    }
                    break;
                }
            }

            self.decimal_point -= @as(i32, @intCast(read_index)) - 1;
            if (self.decimal_point < -decimal_point_range) {
                self.num_digits = 0;
                self.decimal_point = 0;
                self.truncated = false;
                return;
            }

            const mask = math.shl(MantissaT, 1, shift) - 1;
            while (read_index < self.num_digits) {
                const new_digit = @as(u8, @intCast(math.shr(MantissaT, n, shift)));
                n = (10 * (n & mask)) + self.digits[read_index];
                read_index += 1;
                self.digits[write_index] = new_digit;
                write_index += 1;
            }
            while (n > 0) {
                const new_digit = @as(u8, @intCast(math.shr(MantissaT, n, shift)));
                n = 10 * (n & mask);
                if (write_index < max_digits) {
                    self.digits[write_index] = new_digit;
                    write_index += 1;
                } else if (new_digit > 0) {
                    self.truncated = true;
                }
            }
            self.num_digits = write_index;
            self.trim();
        }