one thing I've always liked the idea of is diction...

# tornadofx

[groostav]

one thing I've always liked the idea of is dictionaries keyed by type, that return typed values.

Coroutines implemented this with coroutine scope, where you can write coroutineScope[Job] and the static type of the return expression is Job. Similarly the static type of coroutineScope[Dispatcher] is Dispatcher.

I'm looking at Node.properties: Map<Object, Object> and wishing it was something similar to CoroutineContext. Ideally I could write something like myNode.typedProps[ImportantListener]...

Has anybody implemented this?

[Ruckus]

That works with coroutines because the scope getter only accepts a specific interface (or maybe sealed class, I don't remember for sure) that the companions of all the valid types implement.

The closest you could get to what you're going for would be to pass in a class (using an inline function for pretty syntax), and probably wrap the class in a private wrapper to avoid a duplicate key issue.