I do not closely follow the core source commits, but please bare with me. I will keep it short.
Recently, changeset#5685  caught my attention as I've been waiting for some date_helper love for a VERY long time.
What bothered me is that when this changeset was merged into the 1.2-pre-release branch (at changeset#5686 ) a change to caching.rb crept in , which was not in the original patch.
I didn't notice a roll back in the revision log of caching.rb so I am assuming, no one has noticed yet?