Yeah it looked good t me as well, but causes a spec to fail. Looks like it's a fakefs problem:

```
1.9.3-p327 :001 > Dir["app{,-*}.conf"]
 => ["app.conf", "app-web.conf"]
1.9.3-p327 :002 > require 'fakefs'
 => true
1.9.3-p327 :003 > Dir["app{,-*}.conf"]
 => []
```