Weird space before last parenthesis

[jcubic]

Way to reproduce:

1. Open demo
2. type (map 1+ (range 9))
3. it display: (1 2 3 4 5 6 7 8 9 )

[jcubic]

The problem is that cdr after last cell (that hold 9) is empty list instead of nil. I need remove nil from the code and use empty list like in scheme. Or make nil the same as empty list.