Comment 6 for bug 1559248

This is a nasty link, but I think it'll get you to the right conversation: https://github.com/ubuntu-core/snappy/pull/1095/files/ea79104a5d4c1df2407d62bdf060fe992336cd39#diff-a34e166c5b3016c122430c5884f41e9bR236 . The Snappy team decided on "common" there. It's been merged, but not released just yet. Feel free to discuss it with them!