Thank you for the feedback. My design decision is of course a tradeoff. When multiple channels are exposed to the users (not encapsulated inside the lib), this forces them to use "select". And this is very error prone in my experience

I never needed to use select on an error channel for my use cases because at the point I operate on the error channel I want to block for completion. And I provide helpers for the desired behavior for the channel so I don't even directly receive from it. I see that some of Rill is designed to operate on continuous streams, and in that light the design decision makes sense. For my use cases though the stream always had an end.