Just guessing here: I don't think it's going to be 100%. Sometimes it's not 100% even between versions of the same lib (breaking changes, major versions). If i

Just guessing here: I don't think it's going to be 100%. Sometimes it's not 100% even between versions of the same lib (breaking changes, major versions). If it's good enough people will start using it and the old version will just fail into obsolescence.