Tolerate the condition of invalidity.
Tolerate the condition of invalidity.

With ruby 1.8, dm-types automatically convert a slug with invalid characters into valid one.
Therefore the slug should be raise a validation error, or converted to other string.

fjordllc/blog-kowabana-jp,kmamiya/lokka,fjordllc/jobs-fjord-jp,jiikko/blog,morygonzalez/portalshit.net,komagata/docs-komagata-org,jiikko/blog,hrysd/lokka,komagata/docs-komagata-org,morygonzalez/lokka,lokka/lokka,willnet/lokka,komagata/docs-komagata-org,lokka/lokka,komagata/docs-komagata-org,hrysd/lokka,horaotoko/horaotoko_F-rik-l,horaotoko/kowabana_movie,willnet/lokka,wakate/wakate.org-lokka,fukajun/lokka,kmamiya/lokka,kmamiya/lokka,wakate/wakate.org-lokka,fukajun/lokka,morygonzalez/portalshit.net,machida/zurui-book,morygonzalez/portalshit.net,lokka/lokka,horaotoko/kowabana_movie,willnet/lokka,horaotoko/horaotoko_F-rik-l,cheria/try_lokka,fjordllc/blog-kowabana-jp,morygonzalez/lokka,cheria/try_lokka,lokka/lokka,fjordllc/jobs-fjord-jp,morygonzalez/lokka,machida/zurui-book,fukajun/lokka,morygonzalez/portalshit.net,jiikko/blog,jiikko/blog