I'm helping to prototype a beta for a service that will integrate with GitHub to analyze Pull Requests for backwards compatibility. This whole thing came from a lot of pain with internal projects when we mistakenly introduced backwards-incompatible changes into libraries only to have everything explode mysteriously when dependencies on the projects using the libraries were updated, something that should go smoothly if Semantic Versioning is used correctly by all dependencies.

I'd love your feedback, is this a problem for you? Which programming languages would benefit from this most? (I come from a PHP background but I get the impression that JS folk get a lot of heartache because of this too, is that true?).

Thanks!