DHH did suggest it would become a runtime check, vs a gem dependency last week.<p>But it seems to have made it into the beta as a gem dependency.<p><a href="https:&#x2F;&#x2F;github.com&#x2F;rails&#x2F;rails&#x2F;pull&#x2F;22585#discussion_r47515413" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;rails&#x2F;rails&#x2F;pull&#x2F;22585#discussion_r475154...</a>