mozilla-b2g/gaia — pull request #4164 by eikes (2012-08-30 18:56:17+00:00)
Title: Use Array.isArray function from ES5 because it is faster and easier to read

ECMAScript 5 provides this function, so it should be used.

https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/isArray