Coroutines native-mt versus normal artifacts

Where are the differences between versions 1.3.9 & 1.3.9-native-mt documented for the coroutine libraries?

e.g.: org.jetbrains.kotlinx:kotlinx-coroutines-core

I assume that 1.3.9-native-mt uses native multithreading. If so, what platforms are supported? Are there any advantages to using 1.3.9 instead of 1.3.9-native-mt for a platform that is supported by the latter?