I see these two flags now in the kotlin source code, is this now supported with some special flags in the gradle plugin??

public static final CompilerConfigurationKey<Boolean> INTERFACE_COMPATIBILITY =
            CompilerConfigurationKey.create("Generate additional 'DefaultImpls' class files for jvm 8 target for compatibility with 6 target interfaces");

    public static final CompilerConfigurationKey<Boolean> JVM8_TARGET_WITH_DEFAULTS =
            CompilerConfigurationKey.create("Generate default methods in interfaces");

@max.kammerer I think was the person who added those according to git blame. Did the feature get implemented but did the flags never get exposed through the CLI?