rack/rack — pull request #595 by benpickles (2013-08-20 20:45:19+00:00)
Title: Use `sub` as we only need to substitute once.

I hope you like micro optimisations...

```
user system total real
gsub 0.030000 0.000000 0.030000 ( 0.024439)
sub 0.000000 0.000000 0.000000 ( 0.008700)
```

https://gist.github.com/benpickles/6286953