This one does not *force* slugs, but usually it will probably result
in a niceish one.
The end *result* of the algorithm will (presumably, I have not tested
it) result in these resolutions for these situations:
- If we have a slug, make sure it's clean and sanitized, and if it's
unique, we'll use that.
- If we have a title, slugify it, and if it's unique, we'll use that.
- If we can't get any sort of thing that looks like it'll be a useful
slug out of a title or an existing slug, bail, and don't set the
slug at all. Don't try to create something just because. Make
sure we have a reasonable basis for a slug first.
- If we have a reasonable basis for a slug (either based on existing
slug or slugified title) but it's not unique, first try appending
the entry's id, if that exists
- If that doesn't result in something unique, tack on some randomly
generated bits until it's unique. That'll be a little bit of junk,
but at least it has the *basis* of a nice slug!
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