jquery/jquery — comment on commit 3ad0ba62f03ff3d7aec7d3dfb25492cdf33350a7
File:  line 0
By Krinkle:

I wasn't suggesting to use the ` in ` operator... suggesting to use strict comparison to the `undefined` reference instead of the string "undefined" returned by the `typeof` operator. As done in other parts of jQuery core, like [here](https://github.com/jquery/jquery/blob/f3a4d261ecd0e858515f6e3fa8f5ff59078ec895/src/core.js#L183)