We are talking about APIs (Application Programming Interfaces), not implementations. Of course you are free to change the implementation of your API at any moment, as long as you keep the semantic and performance characteristics.
If you have a much improved design which allows for a better implementation then it would be perfectly fine if you reimplement the old API on top of the new API. As long as this is strictly transparent (source and binary, if this makes sense), then why not.
Linus attitude about not breaking user space is the correct one.
If you have a much improved design which allows for a better implementation then it would be perfectly fine if you reimplement the old API on top of the new API. As long as this is strictly transparent (source and binary, if this makes sense), then why not.
Linus attitude about not breaking user space is the correct one.