Yeah, you could use a true `ImmutableMap` in your ...

# announcements

[zoltu]

Yeah, you could use a true ImmutableMap in your Kotlin code and when you need to call a Java library you do something like, myImmutableMap.toJavaMap. But you are still in the same position of the library probably really expects a Map and you just have to hope that they don't call any write methods.