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kotlinlang

i have run into a bit of a issue with `KCallable::callBy` not working
my method looks like this: `fun process(sleepData: krangle.DataFrame): krangle.DataFrame`
it is called with `this` and `sleepData: krangle.SimpleDataframe`
i verified that it works without that and with other types as arguments and DataFrame as return, i think this is because DataFrame is a interface and SimpleDataFrame is internal
the exception is being thrown in a native method: `NativeMethodAccessorImpl::invoke0`
and it only says: `Argument type mismatch`