sstephenson/prototype — comment on commit 460be4691af9e4e92908c9ac707597bad69be57c
File: src/prototype/lang/array.js line 517
By jdalton:

> First place I saw it was in all the MDN polyfills for array extras (example). It does feel a bit magical, and I'm not wild about that, but it saves me from having to implement the crazy conversion rules in the spec, so it's a dear friend of mine.

I first saw the use of `>>>` aroundish this:
http://www.mail-archive.com/google-caja-discuss@googlegroups.com/msg01606.html back in 09 when I was trying to make methods more spec compliant.