andrew/node-sass — pull request #338 by sindresorhus (2014-06-06 14:50:38+00:00)
Title: don't modify the user supplied options object directly

this can cause unintended side-effects if the user uses the same options object for multiple sass calls.

*note: i could have put it in `prepareOption`, but need to have it in `renderFile` directly anyways, so would just have saved one instance. clearer this way.*