mapnik/Cascadenik — pull request #36 by bwg (2013-03-08 22:46:39+00:00)
Title: fix dash array retina scaling when numbers are same value

When the values of a `numbers` object were different, scaling worked fine. However when the values were the same, the declaration was getting dropped during compilation when scaled for retina (--2x)

ex.
```
dasharray: 2, 5; <- worked
dasharray: 2, 2; <- dropped
```

I'm not really clear why it was behaving this way, but the fix is to convert the `values` property of a `numbers` object back to a tuple after scaling, where previously it was a list after scaling.