I'd like to evaluate Mercurial for my working projects. But most of my projects very heavily rely on the presence of svn:externals-like support. I've searched over StackOverflow and googled for corresponding support in Mercurial. All I found is subrepo feature added in Mercurial 1.3, but the page for this feature said:
subrepos are an experimental feature for Mercurial 1.3. So don't do this on mission critical repositories!
I don't want to use something unstable.
Can anybody shed some light on the real status of this feature, and the plans of polishing/finishing it and when it will be called "stable" and ready for mission critical repositories?