Comment 1 for bug 1496737

Ahh, misuse of str.rstrip(). Since names that aren't UUIDs are purely for convenience (Kobo drops KePubs as $UUID.kepub.epub) this isn't all that important. The biggest problem is name collisions if a name ends with a combination of the characters '.epub', which isn't too likely I don't think. Will get to this when I have a few minutes, looks like using str.replace() instead should fix this. Might even announce a new major version that does it more like Kobo and forces using UUID names.