less/less.js — pull request #1773 by matthew-dean (2014-01-02 23:03:27+00:00)
Title: Fixes "function" test against regular expressions

In some browser engines (especially older versions of Webkit), this
test fails when the argument is a RegExp.

See:
http://stackoverflow.com/questions/5054352/why-use-typeof-for-identifyin
g-a-function

Fix tested and works with Adobe AIR.