rspec/rspec-expectations — comment on commit d3e53109d36d1fef17b70e26e5b2adeeaf3aa078
File:  line 0
By dchelimsky:

Little by little. Have you checked out the rdoc for the release candidates? It's getting much closer to where we can use it to say "this is API, this is not" - but there's quite a bit more to do before can actually proclaim SemVer compliance.