And if I recall correctly,

suspendableCoroutine

is a low-level primitive, so it's reasonable to replace it with

CompletableDeferred

. Someone should correct me if I'm wrong, or maybe provide details on why.

@r4zzz4k Did you see the KEEP in kotlinx.coroutines? It uses those for adapting callback based apis like vertx... there's also a cancellable version... I wonder if the KEEP is trying to propose good practices there or just showing internals?