How am I supposed to use os/spawn?

[amano-kenji]

It seems to me that I should always call os/spawn as below.

(try
  (with [proc (os/spawn ["prog" "arg1"] :p {:out :pipe})]
    (ev/read (proc :out) :all nil 5))
  ([_] nil))

or

(try
  (with [proc (os/spawn ["prog" "arg1"] :p {:out :pipe})]
    (ev/with-deadline 5
      (os/proc-wait proc)))
  ([_] nil))

If I don't force proc to be closed with with, CPU usage skyrockets... I don't understand why, but it does.

If I don't set a timeout through ev/read or ev/with-deadline, a zombie process can freeze a janet script for ever.

My way seems verbose. Is this the right way to use os/spawn? Or, are there better and cleaner ways?

[amano-kenji]

This is turned into an issue.