Ah, that's good. There was a talk at KotlinConf 20...

# coroutines

[mp]

Ah, that's good. There was a talk at KotlinConf 2017 that said it boxed; I'm glad that's not true.

[Ruckus]

Kotlin will box basically anywhere Java will box, basically anywhere you use generics, nullable values, or objects (e.g. returning an Int from a function that returns Any will box it)

[mp]

Cool, thanks for clarifying.

[Ruckus]

It is actually a bit smarter than that though. For example, if you have an inlined higher order function (which use generics), it will use the primitive type instead.