On `0.26.0` I see in the release notes that `Dispa...

# coroutines

[danny]

On 0.26.0 I see in the release notes that Dispatchers.Default is now default dispatcher, but I had some existing code that was roughly runBlocking { someList.map { async { <do stuff with 'it'> } }.map { it.await } } that previously ran on CommonPool by default, but after the upgrade is constrained to the main thread. Guess I'm missing some detail around the structured concurrency changes...

[danny]

If I change that to async(Dispatchers.Default) I get what I expect, but I don't follow why that wouldn't be the case by default?

[bj0]

async now inherits the context of its parent (runBlocking). To get the same behavior you would use GlobalScope.async

[bj0]

or use an explicit context (better)

[bj0]

or create your own scope (even better?)

[danny]

Ah! Guess I'd better go and read the blog post and release notes more closely!