Major Bug in v1.1.0
David made me aware of a fairly major bug where any Pure Comments instance without data-post-slug set, would fail. This is because I hadn’t moved the slug-detection function over from the hosted version I’ve been working on...because I'm an idiot that gets easily confused, and I'm not use to managing multiple complicated code bases.
Anyway, I've patched the issue and released v1.1.1 of Pure Comments, which fixes the problem and now slugs are inferred from the post URL when data-post-slug is not set, as documented in the README.
Thanks, David!