jdalton/underscore — comment on commit 4a5c2ac818ed856813a7e7633f203cf186b942af
File: underscore.js line 149
By jdalton:

This should have been part of the initial for-in pull request, but I forgot to commit it :P
It goes w/ the theme of optimizing for common use as the only place that set's a context is in the `each()` method and that simply does a wrapper around `iterator`.