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

Perhaps use `!== undefined` instead of `typeof .. !== "undefined"` ? Afaik 'undefined' can be safely used in a strict comparison within jQuery context since it's explicitly made undefined in the closure. Using a strict reference comparison gives faster performance then executing the typeof operator and doing a string comparison on the result.