twitter/commons — pull request #41 by benjyw (2012-07-18 00:37:09+00:00)
Title: Fix pants invalidation bug.

Extra invalidation data had a fixed key for all targets in a non-flat
build, so the invalidation only applied to the first target, which
updated the key and made it appear to be unchanged for the subsequent
targets.

This change prefixes the key with the id of the set of targets.