Going off on a tangent: I dislike standard sluggification algorithms; they’re far too fond of throwing away useful parts of the title, like small words in some or turning C++ into just c in almost all cases. parsing-c-is-literally-undecidable would be so much better as parsing-c++-is-literally-undecidable (but note that Amazon S3’s HTTP server has a broken implementation of + in file names that they refuse to fix; with that exception, using + in the URL is perfectly safe everywhere I know of) or even parsing-cpp-is-literally-undecidable (you might choose this manually) or parsing-c-plus-plus-is-literally-undecidable (a sluggifier might produce this).