cloudhead/less.js — pull request #690 by souldreamer (2012-03-07 14:04:35+00:00)
Title: mix() default weight value

Add default 50% weight for the ```mix()``` function so that practice matches the documentation.

Used ```if(!weight)``` as it's on average the fastest way to check the presence of the parameter across IE9/FF/Chrome (see: http://jsperf.com/undefined-argument-vs-arguments-length), and being an object, null would require the same response and 0 wouldn't be a value...

**Re:** https://github.com/cloudhead/less.js/issues/610