Publishers surprised about Canada Post restrictions on half-wrap covers

Canada Post -- citing "health and safety" concerns -- will be limiting half-wrap covers on magazines. They will only be allowed on the front (see a typical newsstand copy of The Walrus) if the back cover is a full page size. Until now, magazines have been able to have half-wraps or half-overcovers front and back. It's not clear what the safety issue might be (paper cuts?). Although it was