Boris Feld <boris.feld@octobus.net> [Fri, 30 Mar 2018 12:43:08 +0200] rev 37166
bundlespec: introduce an attr-based class for bundlespec
We will add support of contentops in the next patch, introduce a class instead
of returning a 4-items tuple.
Differential Revision: https://phab.mercurial-scm.org/D2971