Reporting back on the weird app crash w/ no stacktrace issue (not even raw "adb logcat") from yesterday.
Turned out the autoconverted class had a method that was autoconverted to non-null strings. And a null was passed in.
So next question is: why would Kotlin override the crash handler and not log anything when this happens? I've seen this work properly (with stacktrace) on other projects...just not this one so far...
Using Kotlin 1.2.31 or 1.2.30 makes no difference.