RFC: expectations/assertions

Morning Internals [, and Dmitry :)], I came across a reason to think about assertions again today, my original, pretty radical, patch was worked on by dmitry, I updated the RFC a while ago but allowed the conversation to die down. Nikita pointed this out around the same time: https://gist.github.com/krakjoe/4a2145e5a6ddc26b1dc1 Still, there's no reason for us to have a crappy assertion api as part of the core just because there's a way around it(-ish) in user land. So, I think now is a good time to revive the discussion, the patch is pretty unobjectionable, and has been updated for master. I'd like to move this to a vote pretty swiftly, any objections ? Cheers Joe