Sort of, yeah. They're taking a very strict approach to semver - if it could potentially break anyone's code out there, it's a breaking change that warrants a m

Sort of, yeah. They're taking a very strict approach to semver - if it could potentially break anyone's code out there, it's a breaking change that warrants a major version bump. I'd wager that the vast majority of Node APIs currently on 4.x could swap in 5.0 without any issues.