<@U5B2GP4NN> Current architecture for `select` sup...

# coroutines

[elizarov]

@vaskir Current architecture for select supports two general-purpose communication mechanisms: channels (`onSend`/`onReceive`) and futures (onAwait). As long as you can extract your functions to return either a channel (via actor or produce) or a future (via `async), then you’ll be able to use it in selects.