Comment 13 for bug 1582515

So I am now implementing this change and just noticed that we still have inconsistencies. snapcraft.yaml takes the fileset keyword 'snap' which of course is != to 'prime' which would also be a point of confusion.

For histories sake, in a galaxy far far away this was once all aligned: snapcraft snap, snap dir, snap keyword in snapcraft.yaml.

Should we realign everything?