It only retains the `Job` object (it is small), it...

# coroutines

[elizarov]

It only retains the Job object (it is small), its CoroutineContext (one very small object that is unique for this coroutine) and its completion cause, which would be either Unit for a coroutine that completes successfully or a Cancelled object that keep a references to its CancellationException. That exception is probably the largest part of it.