cfunction
(ev/go fiber &opt value supervisor)
Put a fiber on the event loop to be resumed later. Optionally pass a
value to resume with, otherwise resumes with nil. Returns the fiber.
An optional `core/channel` can be provided as well as a supervisor.
When various events occur in the newly scheduled fiber, an event will
be pushed to the supervisor. If not provided, the new fiber will
inherit the current supervisor.
(def f (ev/go (coro "world"))) # coro is great for fast fiber creating
(ev/sleep 0.0001) # give ev a chance in the REPL, remove in file
(fiber/last-value f) # "world"