是否存在与Mercurial集成的错误/问题跟踪系统？

I've used Trac/Subversion before and really like the integration. My current project is using Mercurial for distributed development and it'd be nice to be able to track issues/bugs and have this be integrated with Mercurial. I realized this could be tricky with the nature of DVCS.I've used Trac/Subversion before and really lik