Backwards incompatibility: I just dusted off an old repo using Kotlin 1.3.50 and attempted to work on it with IntelliJ 2019.3.2. Imagine my surprise to learn that 2019.3.2 is not about to build my 1.3.50 project. Of course, I am using all sorts of experimental code and pre-releases so I should not be all that surprised. So given that this WILL happen from time to time, what can I do to minimize the pain, short of upgrade to the latest Kotlin version?