Consider -Xlenient-classfiles for a more general option that might include future relaxations.  Or -Xrelax, -Xchill, or -Xcali-style.

There's not much guidance in ScalaSettings on camel case or whether X/Y prefix is desirable. My taste is for `overrideObjects`.  Then in code, you don't care if it's X/Y or whether the option name has embedded dashes.