petebrowne/sprockets-helpers — pull request #17 by timmfin (2013-06-13 16:48:41+00:00)
Title: Ensure that changes to the source file in asset_tag force the current asset (for example, an erb file) to have its cache invalided.

This is particularly helpful when debug/expanded is turned on and you are using javascript_tag or stylesheet_tag. Without this, if you changed the require directives for a js/css file you were including, the erb wouldn't update until you modified/touched it as well.