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kotlinlang

Is `-Xlambdas=class` here to stay for the foreseeable future, is it truly relegated to legacy and is expected to be deprecated at some point in the foreseeable future, or is its status still nebulous?

Most likely it will stay for a very long time. Also likely the "X" prefix will be removed

The help text for `kotlinc -X` ought to say what the default is. It's "class" for Kotlin 1.x and "indy" for 2.x - figured out by experimentation. Also, the sentence "Requires `-jvm-target 1.8` or greater" should be removed as Kotlin doesn't support anything older.