Styles with MBs worth of data: URIs use a ton of memory that's never reclaimed

[JasonBarnabe]

Some speculation at http://stackoverflow.com/questions/20385767/finding-the-cause-of-a-memory-leak-in-ruby

[JasonBarnabe]

It looks like the answer on StackOverflow was correct - it was creation of a whole lot of little strings that was causing the problem. The code to handle escape sequences was taking the URL, calling scan, map, and join on a character-by-character basis (even for non-escape sequences). I've modified it to use gsub only on escape sequences. The existing tests pass, and my pathological test posted on StackOverflow went from:

Memory 12404KB
Memory 292516KB

to

Memory 12236KB
Memory 19584KB