even worse: id i use a `data class` not inheriting...

# javascript

[thana]

even worse: id i use a data class not inheriting from anything that names aren't mangeled at all. but if i implemement or extend from a class declared external the names get mangeled contradicting what the documentation says

[U75957]

I also suffer from it. Related with my question https://kotlinlang.slack.com/archives/C0B8L3U69/p1558159423207500