In reply to @isofruit "Could try to have": I have been reviewing
`src/expect.nim`  from `cap10` ... there are some conditions that I think would
need to be cleaned up, like closing the session and fd if the process exits
unexpectedly instead of allowing the fd to be inspected for errors, but
generally I think it might be a good starting point for what I need. Though, I
also think I would need a way to setup the ExpectObject to not require spawning
a cmd and instead pass in descriptors directly.