Actor examples and Sequences - which is 1.3 "correct"?

I figured out what I wanted, but not how to do it:

  1. Little chunks of code that take in (a collection of stuff), and produce a (collection of different stuff) – like a map, but not 1:1.
  2. That all run in coroutines, to make use of all my cores
  3. That have reasonable capacity constrained channels so as not to blow up with an OOM.

I don’t know if the “collection of stuff” should be a sequence, or a channel, or what.