In practice that isn't quite as simple as you make it sound. People come to rely on bugs, weird edge cases, undefined or undocumented behaviours in v1 so you en

In practice that isn't quite as simple as you make it sound. People come to rely on bugs, weird edge cases, undefined or undocumented behaviours in v1 so you end up having to spec and replicate them in your v2 shims. Convincing people to stop using libraries in such a fragile way would be the real trick.