The API is already stable (meaning we are already following our stability practices when making changes during 9.0)
We will make the decision whether or not to completely remove the old SWIG support in V10 based on what we know about the new API’s ability to support people’s needs. If you wait until V10 to test whether or not the API meets your needs, and you happen to have a need that nobody else asked for earlier, you risk losing that ability until it can be re-added.
But I found a few issues and it still works after removing the environment variables again.